Replication: don't even queue replies to master commands.
Replication: don't even queue replies to master commands.

When master send commands, there is no need for the slave to reply.
Redis used to queue the reply in the output buffer and discard the reply
later, this is a waste of work and it is not clear why it was this way
(I sincerely don't remember).

This commit changes it in order to don't queue the reply at all.

All tests passing.

sunheehnus/redis,neomantra/redis,hornen/redis,xuzhezhaozhao/redis_reading,rogerlz/redis,modulexcite/redis,mengzhejin/RedisStudy,seppo0010/redis,sunlianqiang/redis-3.0-annotated,fengshao0907/redis-3.0-annotated,jasonkying/redis,oranagra/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,louisliangjun/redis,narma/redis,gilala/hredis,SummonY/redis,xlzhan/redis,yybirdcf/learn-redis,jasonkying/redis,mengyou0304/redis,splitice/redis,tanghaodong25/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,MasahikoSawada/redis,brg-liuwei/redis,mcanthony/redis,gilala/redis,abhiklodh/redis,jbochi/redis,0x55/redis-3.0-annotated,hawkchch/redis,zhoudayang/redis,jackyan/redis,190235047/redis,ituncle/redis,pkdevbox/redis,kensou97/redis,shreesundara/redis,0x55/redis-3.0-annotated,pietern/redis,jingjidejuren/redis,mumingv/redis-3.0-annotated,oranagra/redis,mingyaaaa/redis,duanx/redis,kensou97/redis,jxwr/redis,supasate/redis,h0x91b/redis,clamoriniere1A/redis,Soledad89/redis,HeartSaVioR/redis,Soledad89/redis,zhaobo1023/redis-3.0-annotated,unasm/redis-3.0-annotated,francischan714/redis,dayuoba/redis,josiahcarlson/redis,thomasdarimont/redis,vincent-vivian-liu/redis,ton31337/redis,july2993/redis,j0hnma/hszredis,wenxueliu/redis_comment,netroby/redis,PKRoma/redis,ncopa/redis,universsky/redis,antirez/redis,kaushik94/redis,gongice/redis-3.0-annotated,Aliceljm1/redis-3.0-annotated,yuhc/redis-benchmark-enhanced,neomantra/redis,elkingtonmcb/redis,MSOpenTech/redis,ErikDubbelboer/redis,honestme/redis,kaushik94/redis,GrimDerp/redis,OmarQunsul/graph-redis,ipmobiletech/redis,CodeJuan/redis,neomantra/redis,ctripcorp/redis,wbailey5/redis,Hailei/redis,supasate/redis,moonbingbing/redis-3.0-annotated,jacklee0810/redis-3.0-annotated,jackyan/redis,unasm/redis-3.0-annotated,wujf/redis,seppo0010/rlite-server,ton31337/redis,nuxeh/redis,taoguan/redis,taoguan/redis,seppo0010/redis,gaoxianglong/redis,SyntaxStacks/redis,aim-for-better/redis,atreeyang/redis,Wangyao14cyy/redis,cusspvz/redis,Wangyao14cyy/redis,Aaron1992/redis,louisliangjun/redis,shreesundara/redis,xlzhan/redis,kmiku7/redis,badboy/redis,zczhuohuo/redis,wenxueliu/redis_comment,4396/redis,seandsky/redis,riyan8250/redis,ytjiang/redis,Hailei/redis,shreesundara/redis,saisai/redis,mumingv/redis-3.0-annotated,himoca/redis,Wangyao14cyy/redis,yuhc/redis-benchmark-enhanced,spinlock/redis,rrsean/redis-3.0-annotated,dayuoba/redis,zczhuohuo/redis,blackmady/redis,0x55/redis-3.0-annotated,qiyang0221/redis,mengyou0304/redis,OmarQunsul/graph-redis,MSOpenTech/redis,jbochi/redis,shreesundara/redis,pkdevbox/redis,netroby/redis,yossigo/redis,roth1002/redis,supasate/redis,Sciumo/redis,allengaller/redis,ofirluzon/redis,cusspvz/redis,mumingv/redis,hawkchch/redis,j0hnma/szredis,darksideofthemoo/redis-histogram,pmem/redis,darksideofthemoo/redis-histogram,dayuoba/redis,csuhawk/redis,gilala/redis,guker/redis,rrsean/redis-3.0-annotated,SummonY/redis,harrisonfeng/redis,elkingtonmcb/redis,duanx/redis,simplestbest/redis,mengzhejin/RedisStudy,miaoyc1989/redis-3.0-annotated,clamoriniere1A/redis,itugs/redis,clamoriniere1A/redis,PradheepShrinivasan/redis,YongMan/redis,citusdata/redis,ttuna/msot-redis,msn217/redis-3.0-annotated,msn217/redis-3.0-annotated,OmarQunsul/graph-redis,jingjidejuren/redis,itamarhaber/redis,ErikDubbelboer/redis,gaoxianglong/redis,wangyikai/redis,tjschuck/redis,huyuezheng/redis,sunheehnus/redis,xuzhezhaozhao/redis_reading,mengzhejin/RedisStudy,adamweixuan/redis-3.0-annotated,yuhc/redis-benchmark-enhanced,pedigree/redis,brg-liuwei/redis,brg-liuwei/redis,zhaobo1023/redis-3.0-annotated,nnog/redis,miaoyc1989/redis-3.0-annotated,AALEKH/redis,csuhawk/redis,ipmobiletech/redis,GitHubMota/redis,hgl888/redis,zguangyu/redis,antirez/redis,charsyam/redis,josiahcarlson/redis,yossigo/redis,HouKangkang/redis-3.0-annotated,hornen/redis,Markgorden/redis,ofirluzon/redis,GitHubMota/redis,rogerlz/redis,yuzhangjob/redis-3.0-annotated-unstable,gilala/bjredis,HunanTV/redis,janekmi/redis,jackyan/redis,kaushik94/redis,Aaron1992/redis,citusdata/redis,healerkx/redis,yuhc/redis-benchmark-enhanced,splitice/redis,huyuezheng/redis,rrsean/redis-3.0-annotated,gilala/redis,badboy/redis,duanx/redis,xlzhan/redis,Sciumo/redis,GrimDerp/redis,PKRoma/redis,mgk/redis,gilala/redis,riyan8250/redis,sunlianqiang/redis-3.0-annotated,holstvoogd/redis,qiyang0221/redis,wenxueliu/redis_comment,healerkx/redis,seandsky/redis,mcanthony/redis,gilala/hredis,idning/redis,blackmady/redis,ksarch-saas/redis,izhoujie/redis,ipmobiletech/redis,pkdevbox/redis,blackmady/redis,xuzhezhaozhao/redis_reading,AplayER/redis,programmecat/redis,linfangrong/redis,tellapart/redis,zhiliaoniu/redis,Markgorden/redis,allengaller/redis,Soledad89/redis,pietern/redis,colstrom/redis,modulexcite/redis,moonbingbing/redis-3.0-annotated,gechong/redis-3.0-annotated,zguangyu/redis,AplayER/redis,badboy/redis,AALEKH/redis,shining-yang/redis,pmem/redis,twskipper/redis,oranagra/redis,healerkx/redis,davidradunz/redis,zhoudayang/redis,rouzier/redis,ReadCode/redis-3.0-annotated,YuanZhewei/redis,ncopa/redis,jbochi/redis,takeshineshiro/redis,Sciumo/redis,gilala/bjredis,netroby/redis,RepmujNetsik/redis,gilala/hbjredis,HunanTV/redis,dayuoba/redis,wangyikai/redis,onlymellb/redis-3.0-annotated,jingjidejuren/redis,wbailey5/redis,janekmi/redis,mgk/redis,tellapart/redis,jackyan/redis,a-pavlov/redis,blackmady/redis,thomasdarimont/redis,whille/redis-3.0-annotated,taoguan/redis,wbailey5/redis,huyuezheng/redis,shshlzh/redis-3.0-annotated,hgl888/redis,dongqifan2/redis-3.0-annotated,msn217/redis-3.0-annotated,rogerlz/redis,csuhawk/redis,takeshineshiro/redis,wenxueliu/redis_comment,adamweixuan/redis-3.0-annotated,huangz1990/experiment-redis,RepmujNetsik/redis,tjschuck/redis,xujunhai1991/redis,huangz1990/experiment-redis,Wangyao14cyy/redis,programmecat/redis,dreamquster/redis,zhiliaoniu/redis,shshlzh/redis-3.0-annotated,dreamquster/redis,StevenTsai/redis,shshlzh/redis-3.0-annotated,spinlock/redis,RepmujNetsik/redis,simplestbest/redis,louisliangjun/redis,twskipper/redis,jingjidejuren/redis,weizijun/redis,neomantra/redis,josiahcarlson/redis,huangz1990/redis-3.0-annotated,july2993/redis,pcarrier/redis,colstrom/redis,tzq668766/redis-3.0-annotated,ksarch-saas/redis,nnog/redis,spinlock/redis,tzq668766/redis-3.0-annotated,pedigree/redis,simplestbest/redis,pietern/redis,jacklee0810/redis-3.0-annotated,onlymellb/redis-3.0-annotated,programmecat/redis,4396/redis,zhiliaoniu/redis,zhcy/redis,honestme/redis,ReadCode/redis-3.0-annotated,francischan714/redis,kaushik94/redis,maodeyi/redis_lua,miaoyc1989/redis-3.0-annotated,wprice/redis,MOON-CLJ/redis,ErikDubbelboer/redis,cloudrain21/redis,spearhead-ea/redis,yuzhangjob/redis-3.0-annotated-unstable,HeartSaVioR/redis,RepmujNetsik/redis,takeshineshiro/redis,rouzier/redis,seppo0010/rlite-server,ytjiang/redis,ramonsnir/redis,adamweixuan/redis-3.0-annotated,SyntaxStacks/redis,alenslan/redis,hgl888/redis,h0x91b/redis,cloudrain21/redis,GrimDerp/redis,arijitvt/redis,guker/redis,fengshao0907/redis,YuraLukashik/redis,mattsta/redis,charsyam/redis,flashbuckets/redis,whille/redis-3.0-annotated,LongXQ/redis,valdsJohn/redis,SummonY/redis,YongMan/redis,iandyh/redis,yossigo/redis,j0hnma/hszredis,zczhuohuo/redis,Aliceljm1/redis,mattsta/redis,itugs/redis,OmarQunsul/graph-redis,mverrilli/redis,gaoxianglong/redis,yuzhangjob/redis-3.0-annotated-unstable,darksideofthemoo/redis-histogram,kmiku7/redis,HouKangkang/redis-3.0-annotated,hawkchch/redis,seppo0010/rlite-server,soveran/redis,haima-zju/redis-3.0-annotated,aim-for-better/redis,flashbuckets/redis,z-fork/redis,itamarhaber/redis,dongqifan2/redis-3.0-annotated,Sciumo/redis,soveran/redis,buobao/redis-3.0-annotated,onlymellb/redis-3.0-annotated,gechong/redis-3.0-annotated,drinkthere/redis-3.0-annotated,gechong/redis-3.0-annotated,jacklee0810/redis-3.0-annotated,universsky/redis,holstvoogd/redis,fengshao0907/redis-3.0-annotated,YuraLukashik/redis,fengshao0907/redis,guker/redis,zguangyu/redis,fengshao0907/redis,abhiklodh/redis,saisai/redis,arijitvt/redis,charsyam/redis,timothyohare/3rdPartySrc-redis,Aliceljm1/redis,YuanZhewei/redis,gongice/redis-3.0-annotated,PradheepShrinivasan/redis,LongXQ/redis,mcanthony/redis,cnbin/redis,hedisdb/hedis,CodeJuan/redis,izhoujie/redis,magastzheng/redis-3.0-annotated,wprice/redis,fankeke/redis-3.0-annotated,davidradunz/redis,thomasdarimont/redis,haima-zju/redis-3.0-annotated,guker/redis,0x55/redis-3.0-annotated,cloudrain21/redis,splitice/redis,magastzheng/redis-3.0-annotated,190235047/redis,haima-zju/redis-3.0-annotated,janekmi/redis,PradheepShrinivasan/redis,SyntaxStacks/redis,ituncle/redis,francischan714/redis,StevenTsai/redis,programmecat/redis,antirez/redis,allengaller/redis,weizijun/redis,zhoudayang/redis,mcanthony/redis,tanghaodong25/redis,kensou97/redis,ttuna/msot-redis,louisliangjun/redis,universsky/redis,rouzier/redis,rogerchina/redis,Aliceljm1/redis,HouKangkang/redis-3.0-annotated,vincent-vivian-liu/redis,GitHubMota/redis,izhoujie/redis,z-fork/redis,itugs/redis,neomantra/redis,a-pavlov/redis,wprice/redis,rogerlz/redis,tanghaodong25/redis,StevenTsai/redis,mumingv/redis,YuanZhewei/redis,JoeWoo/redis,xujunhai1991/redis,moonbingbing/redis-3.0-annotated,dreamquster/redis,pedigree/redis,abhiklodh/redis,JoeWoo/redis,mengzhejin/RedisStudy,elkingtonmcb/redis,YuraLukashik/redis,PKRoma/redis,yybirdcf/learn-redis,YuraLukashik/redis,duanx/redis,valdsJohn/redis,flashbuckets/redis,tellapart/redis,taoguan/redis,timothyohare/3rdPartySrc-redis,wbailey5/redis,weizijun/redis,MSOpenTech/redis,magastzheng/redis-3.0-annotated,narma/redis,harrisonfeng/redis,saisai/redis,mingyaaaa/redis,wujf/redis,tellapart/redis,citusdata/redis,huangz1990/experiment-redis,honestme/redis,ramonsnir/redis,vincent-vivian-liu/redis,GrimDerp/redis,xuguruogu/redis,charsyam/redis,zguangyu/redis,sunheehnus/redis,ketor/redis,sunheehnus/redis,yossigo/redis,nilyang/redis-tdd-annotation,Aaron1992/redis,zy416548283/redis-3.0-annotated,HeartSaVioR/redis,aim-for-better/redis,h0x91b/redis,healerkx/redis,nnog/redis,jbochi/parallel_redis,huangz1990/experiment-redis,hornen/redis,ctripcorp/redis,timothyohare/3rdPartySrc-redis,gilala/hredis,roth1002/redis,YongMan/redis,atreeyang/redis,nuxeh/redis,wuyu201321060203/redis-3.0-annotated,pcarrier/redis,z-fork/redis,maodeyi/redis_lua,ofirluzon/redis,elkingtonmcb/redis,mengyou0304/redis,jbochi/parallel_redis,wprice/redis,idning/redis,fankeke/redis-3.0-annotated,july2993/redis,harrisonfeng/redis,arijitvt/redis,Hailei/redis,alenslan/redis,brg-liuwei/redis,PKRoma/redis,mgk/redis,shshlzh/redis-3.0-annotated,ouyangkongtong/redis,rogerchina/redis,idning/redis,linfangrong/redis,ksarch-saas/redis,wujf/redis,netroby/redis,devaos/redis,soloestoy/redis,CodeJuan/redis,rouzier/redis,j0hnma/szredis,NBSW/redis,iandyh/redis,nilyang/redis-tdd-annotation,ouyangkongtong/redis,mgk/redis,ituncle/redis,mingyaaaa/redis,gilala/bjredis,charsyam/redis,supasate/redis,4396/redis,weizijun/redis,seandsky/redis,PradheepShrinivasan/redis,tzq668766/redis-3.0-annotated,valdsJohn/redis,MasahikoSawada/redis,huangz1990/redis-3.0-annotated,janekmi/redis,gongice/redis-3.0-annotated,hawkchch/redis,wuyu201321060203/redis-3.0-annotated,jxwr/redis,tjschuck/redis,a-pavlov/redis,buobao/redis-3.0-annotated,drinkthere/redis-3.0-annotated,ctripcorp/redis,qiyang0221/redis,zy416548283/redis-3.0-annotated,h0x91b/redis,itugs/redis,soloestoy/redis,xujunhai1991/redis,MasahikoSawada/redis,soloestoy/redis,modulexcite/redis,fankeke/redis-3.0-annotated,hornen/redis,yybirdcf/learn-redis,riyan8250/redis,shining-yang/redis,cloudrain21/redis,Markgorden/redis,Markgorden/redis,allengaller/redis,190235047/redis,sunlianqiang/redis-3.0-annotated,NBSW/redis,gilala/hbjredis,holstvoogd/redis,ttuna/msot-redis,abhiklodh/redis,arijitvt/redis,slfs007/mk-redis,ReadCode/redis-3.0-annotated,PKRoma/redis,antirez/redis,j0hnma/hszredis,ctripcorp/redis,spearhead-ea/redis,colstrom/redis,j0hnma/hszredis,zhaobo1023/redis-3.0-annotated,LongXQ/redis,josiahcarlson/redis,hgl888/redis,davidradunz/redis,JoeWoo/redis,zhcy/redis,vincent-vivian-liu/redis,GitHubMota/redis,j0hnma/szredis,ipmobiletech/redis,jasonkying/redis,roth1002/redis,devaos/redis,yossigo/redis,splitice/redis,fengshao0907/redis-3.0-annotated,ofirluzon/redis,tjschuck/redis,slfs007/mk-redis,ouyangkongtong/redis,atreeyang/redis,AALEKH/redis,dongqifan2/redis-3.0-annotated,oranagra/redis,LongXQ/redis,simplestbest/redis,HeartSaVioR/redis,whille/redis-3.0-annotated,cusspvz/redis,maodeyi/redis_lua,AplayER/redis,gaoxianglong/redis,huyuezheng/redis,pmem/redis,kensou97/redis,pietern/redis,hedisdb/hedis,shining-yang/redis,HunanTV/redis,ncopa/redis,zhcy/redis,MasahikoSawada/redis,wuyu201321060203/redis-3.0-annotated,MOON-CLJ/redis,twskipper/redis,Hailei/redis,xuzhezhaozhao/redis_reading,wangyikai/redis,aim-for-better/redis,buobao/redis-3.0-annotated,valdsJohn/redis,Aliceljm1/redis-3.0-annotated,badboy/redis,ksarch-saas/redis,soveran/redis,devaos/redis,kmiku7/redis,HunanTV/redis,hedisdb/hedis,seppo0010/redis,AplayER/redis,drinkthere/redis-3.0-annotated,MOON-CLJ/redis,colstrom/redis,zczhuohuo/redis,zhiliaoniu/redis,xuguruogu/redis,davidradunz/redis,wuyu201321060203/redis-3.0-annotated,a-pavlov/redis,itamarhaber/redis,slfs007/mk-redis,MSOpenTech/redis,roth1002/redis,ttuna/msot-redis,StevenTsai/redis,nuxeh/redis,190235047/redis,mengyou0304/redis,alenslan/redis,linfangrong/redis,mumingv/redis,gilala/hredis,gilala/bjredis,soveran/redis,seppo0010/redis,miaoyc1989/redis-3.0-annotated,nilyang/redis-tdd-annotation,seandsky/redis,atreeyang/redis,hedisdb/hedis,pmem/redis,alenslan/redis,flashbuckets/redis,saisai/redis,ncopa/redis,modulexcite/redis,devaos/redis,SummonY/redis,thomasdarimont/redis,tanghaodong25/redis,xujunhai1991/redis,nuxeh/redis,ton31337/redis,pedigree/redis,holstvoogd/redis,rogerchina/redis,YuanZhewei/redis,AALEKH/redis,honestme/redis,nnog/redis,fengshao0907/redis,cnbin/redis,izhoujie/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,himoca/redis,soloestoy/redis,xuguruogu/redis,csuhawk/redis,narma/redis,takeshineshiro/redis,riyan8250/redis,himoca/redis,oranagra/redis,ramonsnir/redis,pkdevbox/redis,soloestoy/redis,xlzhan/redis,seppo0010/rlite-server,zhoudayang/redis,clamoriniere1A/redis,idning/redis,twskipper/redis,harrisonfeng/redis,cnbin/redis,ttuna/msot-redis,ton31337/redis,zy416548283/redis-3.0-annotated,mverrilli/redis,jbochi/parallel_redis,zhcy/redis,ErikDubbelboer/redis,yybirdcf/learn-redis,pcarrier/redis,jxwr/redis,ofirluzon/redis,darksideofthemoo/redis-histogram,dreamquster/redis,4396/redis,ytjiang/redis,july2993/redis,xuguruogu/redis,ketor/redis,YongMan/redis,mingyaaaa/redis,universsky/redis,CodeJuan/redis,wangyikai/redis,mattsta/redis,cnbin/redis,cusspvz/redis,timothyohare/3rdPartySrc-redis,citusdata/redis,NBSW/redis,mverrilli/redis,linfangrong/redis,Soledad89/redis,mumingv/redis,mverrilli/redis,gilala/hbjredis,francischan714/redis,ytjiang/redis,kmiku7/redis,SyntaxStacks/redis,spearhead-ea/redis,rogerchina/redis,Aliceljm1/redis-3.0-annotated,jasonkying/redis,iandyh/redis,itamarhaber/redis,MSOpenTech/redis,huangz1990/redis-3.0-annotated,mumingv/redis-3.0-annotated,iandyh/redis,pcarrier/redis,j0hnma/szredis,wujf/redis,gilala/hbjredis,spinlock/redis,ketor/redis,JoeWoo/redis,ituncle/redis,NBSW/redis,unasm/redis-3.0-annotated,qiyang0221/redis,shining-yang/redis,Aliceljm1/redis,z-fork/redis,ouyangkongtong/redis,nilyang/redis-tdd-annotation,Aaron1992/redis