Cluster: move slotToKeyFlush() to emptyDb().
Cluster: move slotToKeyFlush() to emptyDb().

This way we are sure to destroy the slot->key map every time we destroy
the DB, for instance when reloading a DB due to replication.

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