Remove dead code and fix comments for new expire code.
Remove dead code and fix comments for new expire code.

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