Cluster: set slot error if we receive an update for a busy slot.
Cluster: set slot error if we receive an update for a busy slot.

By manually modifying nodes configurations in random ways, it is possible
to create the following scenario:

A is serving keys for slot 10
B is manually configured to serve keys for slot 10

A receives an update from B (or another node) where it is informed that
the slot 10 is now claimed by B with a greater configuration epoch,
however A still has keys from slot 10.

With this commit A will put the slot in error setting it in IMPORTING
state, so that redis-trib can detect the issue.

yossigo/redis,alenslan/redis,gilala/bjredis,cnbin/redis,itamarhaber/redis,mgk/redis,neomantra/redis,h0x91b/redis,yuhc/redis-benchmark-enhanced,clamoriniere1A/redis,SummonY/redis,Aaron1992/redis,cloudrain21/redis,thomasdarimont/redis,wenxueliu/redis_comment,badboy/redis,Aliceljm1/redis,jasonkying/redis,mgk/redis,gilala/bjredis,universsky/redis,charsyam/redis,dreamquster/redis,Markgorden/redis,riyan8250/redis,a-pavlov/redis,oranagra/redis,twskipper/redis,mcanthony/redis,SyntaxStacks/redis,abhiklodh/redis,duanx/redis,NBSW/redis,ituncle/redis,seppo0010/redis,saisai/redis,gilala/hredis,fengshao0907/redis,july2993/redis,j0hnma/hszredis,AALEKH/redis,Soledad89/redis,oranagra/redis,itamarhaber/redis,davidradunz/redis,csuhawk/redis,ton31337/redis,wujf/redis,pedigree/redis,yossigo/redis,YuanZhewei/redis,PKRoma/redis,alenslan/redis,j0hnma/hszredis,flashbuckets/redis,antirez/redis,JoeWoo/redis,GrimDerp/redis,aim-for-better/redis,antirez/redis,SyntaxStacks/redis,seppo0010/rlite-server,izhoujie/redis,honestme/redis,allengaller/redis,ofirluzon/redis,Wangyao14cyy/redis,ytjiang/redis,GitHubMota/redis,Sciumo/redis,supasate/redis,neomantra/redis,devaos/redis,charsyam/redis,badboy/redis,roth1002/redis,ouyangkongtong/redis,spinlock/redis,thomasdarimont/redis,zhcy/redis,hawkchch/redis,taoguan/redis,nnog/redis,jackyan/redis,francischan714/redis,alenslan/redis,ErikDubbelboer/redis,mumingv/redis,gilala/hbjredis,vincent-vivian-liu/redis,neomantra/redis,dayuoba/redis,jingjidejuren/redis,mengzhejin/RedisStudy,h0x91b/redis,ErikDubbelboer/redis,YuanZhewei/redis,zhcy/redis,mengyou0304/redis,xujunhai1991/redis,wbailey5/redis,mattsta/redis,xlzhan/redis,GitHubMota/redis,StevenTsai/redis,elkingtonmcb/redis,abhiklodh/redis,honestme/redis,riyan8250/redis,blackmady/redis,mingyaaaa/redis,soveran/redis,shining-yang/redis,sunheehnus/redis,ytjiang/redis,soloestoy/redis,MOON-CLJ/redis,izhoujie/redis,valdsJohn/redis,Aaron1992/redis,itamarhaber/redis,neomantra/redis,YuraLukashik/redis,harrisonfeng/redis,seppo0010/rlite-server,nuxeh/redis,AALEKH/redis,YuraLukashik/redis,timothyohare/3rdPartySrc-redis,wujf/redis,guker/redis,spinlock/redis,aim-for-better/redis,cnbin/redis,AALEKH/redis,timothyohare/3rdPartySrc-redis,z-fork/redis,elkingtonmcb/redis,kaushik94/redis,YuraLukashik/redis,JoeWoo/redis,nuxeh/redis,tanghaodong25/redis,seppo0010/redis,hornen/redis,kmiku7/redis,dayuoba/redis,flashbuckets/redis,atreeyang/redis,takeshineshiro/redis,cnbin/redis,zczhuohuo/redis,YongMan/redis,twskipper/redis,seandsky/redis,holstvoogd/redis,wujf/redis,YongMan/redis,ctripcorp/redis,pkdevbox/redis,shreesundara/redis,timothyohare/3rdPartySrc-redis,aim-for-better/redis,mverrilli/redis,Soledad89/redis,citusdata/redis,pcarrier/redis,SyntaxStacks/redis,qiyang0221/redis,hgl888/redis,RepmujNetsik/redis,ituncle/redis,jingjidejuren/redis,rouzier/redis,iandyh/redis,taoguan/redis,mcanthony/redis,YongMan/redis,colstrom/redis,itugs/redis,sunheehnus/redis,arijitvt/redis,mengzhejin/RedisStudy,qiyang0221/redis,nuxeh/redis,brg-liuwei/redis,davidradunz/redis,charsyam/redis,kensou97/redis,allengaller/redis,wujf/redis,spinlock/redis,Markgorden/redis,ctripcorp/redis,takeshineshiro/redis,seppo0010/redis,shining-yang/redis,wenxueliu/redis_comment,HeartSaVioR/redis,soveran/redis,cusspvz/redis,cusspvz/redis,itugs/redis,a-pavlov/redis,xujunhai1991/redis,july2993/redis,devaos/redis,simplestbest/redis,gilala/redis,PKRoma/redis,wprice/redis,josiahcarlson/redis,hornen/redis,Sciumo/redis,saisai/redis,tjschuck/redis,janekmi/redis,mumingv/redis,timothyohare/3rdPartySrc-redis,dayuoba/redis,Soledad89/redis,Wangyao14cyy/redis,xlzhan/redis,nuxeh/redis,iandyh/redis,qiyang0221/redis,Aaron1992/redis,hawkchch/redis,pedigree/redis,janekmi/redis,atreeyang/redis,GitHubMota/redis,mumingv/redis,rogerchina/redis,jbochi/parallel_redis,hgl888/redis,LongXQ/redis,gilala/hbjredis,AALEKH/redis,RepmujNetsik/redis,netroby/redis,roth1002/redis,pmem/redis,zczhuohuo/redis,Wangyao14cyy/redis,CodeJuan/redis,vincent-vivian-liu/redis,LongXQ/redis,tjschuck/redis,Sciumo/redis,xuguruogu/redis,rogerchina/redis,ncopa/redis,clamoriniere1A/redis,itugs/redis,RepmujNetsik/redis,dreamquster/redis,hornen/redis,rouzier/redis,CodeJuan/redis,YuraLukashik/redis,narma/redis,SyntaxStacks/redis,linfangrong/redis,cusspvz/redis,izhoujie/redis,tellapart/redis,vincent-vivian-liu/redis,jbochi/parallel_redis,neomantra/redis,MOON-CLJ/redis,mingyaaaa/redis,wbailey5/redis,pedigree/redis,4396/redis,fengshao0907/redis,zhiliaoniu/redis,mattsta/redis,Aliceljm1/redis,Wangyao14cyy/redis,rouzier/redis,guker/redis,xlzhan/redis,ofirluzon/redis,GrimDerp/redis,jackyan/redis,shining-yang/redis,shreesundara/redis,MasahikoSawada/redis,blackmady/redis,4396/redis,zhcy/redis,hedisdb/hedis,PKRoma/redis,gilala/redis,tanghaodong25/redis,weizijun/redis,iandyh/redis,PradheepShrinivasan/redis,z-fork/redis,modulexcite/redis,fengshao0907/redis,mumingv/redis,citusdata/redis,soloestoy/redis,thomasdarimont/redis,xuguruogu/redis,nnog/redis,gilala/hredis,kaushik94/redis,supasate/redis,arijitvt/redis,ctripcorp/redis,shining-yang/redis,h0x91b/redis,takeshineshiro/redis,ituncle/redis,gilala/hbjredis,csuhawk/redis,sunheehnus/redis,xuguruogu/redis,j0hnma/szredis,mingyaaaa/redis,soveran/redis,jingjidejuren/redis,jasonkying/redis,ncopa/redis,mengzhejin/RedisStudy,gilala/bjredis,mgk/redis,YuanZhewei/redis,Markgorden/redis,kaushik94/redis,PKRoma/redis,zhcy/redis,190235047/redis,valdsJohn/redis,tellapart/redis,abhiklodh/redis,tanghaodong25/redis,huyuezheng/redis,seandsky/redis,ton31337/redis,zguangyu/redis,csuhawk/redis,ncopa/redis,rogerchina/redis,hgl888/redis,yossigo/redis,j0hnma/hszredis,GrimDerp/redis,rogerlz/redis,ofirluzon/redis,yossigo/redis,gilala/hredis,gilala/hbjredis,HeartSaVioR/redis,pmem/redis,rogerlz/redis,j0hnma/szredis,netroby/redis,JoeWoo/redis,190235047/redis,MasahikoSawada/redis,spinlock/redis,ytjiang/redis,CodeJuan/redis,mverrilli/redis,OmarQunsul/graph-redis,harrisonfeng/redis,pedigree/redis,flashbuckets/redis,hedisdb/hedis,soloestoy/redis,mengzhejin/RedisStudy,thomasdarimont/redis,holstvoogd/redis,weizijun/redis,mengyou0304/redis,pkdevbox/redis,Aliceljm1/redis,ipmobiletech/redis,zhiliaoniu/redis,oranagra/redis,pcarrier/redis,seppo0010/rlite-server,zczhuohuo/redis,hedisdb/hedis,atreeyang/redis,pkdevbox/redis,simplestbest/redis,duanx/redis,universsky/redis,shreesundara/redis,davidradunz/redis,clamoriniere1A/redis,ipmobiletech/redis,elkingtonmcb/redis,shreesundara/redis,hedisdb/hedis,190235047/redis,hawkchch/redis,SummonY/redis,jasonkying/redis,linfangrong/redis,mingyaaaa/redis,modulexcite/redis,josiahcarlson/redis,ofirluzon/redis,weizijun/redis,MOON-CLJ/redis,gaoxianglong/redis,cusspvz/redis,supasate/redis,cloudrain21/redis,ErikDubbelboer/redis,gilala/redis,josiahcarlson/redis,narma/redis,guker/redis,huyuezheng/redis,kmiku7/redis,gaoxianglong/redis,taoguan/redis,HeartSaVioR/redis,cloudrain21/redis,antirez/redis,colstrom/redis,cnbin/redis,modulexcite/redis,StevenTsai/redis,zczhuohuo/redis,ctripcorp/redis,AplayER/redis,supasate/redis,healerkx/redis,xlzhan/redis,wangyikai/redis,devaos/redis,izhoujie/redis,ouyangkongtong/redis,healerkx/redis,wprice/redis,roth1002/redis,pmem/redis,jingjidejuren/redis,rogerlz/redis,cloudrain21/redis,jbochi/redis,xujunhai1991/redis,MasahikoSawada/redis,j0hnma/hszredis,davidradunz/redis,harrisonfeng/redis,kmiku7/redis,fengshao0907/redis,4396/redis,july2993/redis,190235047/redis,colstrom/redis,gaoxianglong/redis,janekmi/redis,seandsky/redis,dreamquster/redis,francischan714/redis,jackyan/redis,pcarrier/redis,NBSW/redis,ncopa/redis,wbailey5/redis,wprice/redis,zguangyu/redis,gilala/hredis,simplestbest/redis,citusdata/redis,arijitvt/redis,colstrom/redis,ErikDubbelboer/redis,jbochi/redis,gaoxianglong/redis,hgl888/redis,holstvoogd/redis,StevenTsai/redis,seppo0010/rlite-server,SummonY/redis,valdsJohn/redis,NBSW/redis,oranagra/redis,mverrilli/redis,valdsJohn/redis,badboy/redis,modulexcite/redis,Sciumo/redis,kensou97/redis,GrimDerp/redis,jasonkying/redis,mattsta/redis,universsky/redis,hornen/redis,huyuezheng/redis,universsky/redis,ituncle/redis,tellapart/redis,taoguan/redis,devaos/redis,atreeyang/redis,duanx/redis,roth1002/redis,ton31337/redis,programmecat/redis,yuhc/redis-benchmark-enhanced,josiahcarlson/redis,honestme/redis,badboy/redis,tjschuck/redis,PradheepShrinivasan/redis,mcanthony/redis,soloestoy/redis,itugs/redis,yossigo/redis,riyan8250/redis,soveran/redis,iandyh/redis,AplayER/redis,wangyikai/redis,simplestbest/redis,h0x91b/redis,OmarQunsul/graph-redis,ofirluzon/redis,ipmobiletech/redis,wangyikai/redis,yuhc/redis-benchmark-enhanced,weizijun/redis,zguangyu/redis,allengaller/redis,tellapart/redis,wbailey5/redis,ytjiang/redis,tjschuck/redis,jbochi/parallel_redis,OmarQunsul/graph-redis,LongXQ/redis,antirez/redis,ouyangkongtong/redis,rouzier/redis,StevenTsai/redis,arijitvt/redis,mgk/redis,dreamquster/redis,wprice/redis,a-pavlov/redis,j0hnma/szredis,j0hnma/szredis,kaushik94/redis,zguangyu/redis,allengaller/redis,z-fork/redis,netroby/redis,aim-for-better/redis,gilala/redis,Aliceljm1/redis,charsyam/redis,linfangrong/redis,kmiku7/redis,HeartSaVioR/redis,duanx/redis,SummonY/redis,huyuezheng/redis,z-fork/redis,zhiliaoniu/redis,qiyang0221/redis,oranagra/redis,YuanZhewei/redis,jackyan/redis,ipmobiletech/redis,itamarhaber/redis,wangyikai/redis,MasahikoSawada/redis,pmem/redis,wenxueliu/redis_comment,tanghaodong25/redis,seppo0010/redis,janekmi/redis,holstvoogd/redis,linfangrong/redis,LongXQ/redis,twskipper/redis,brg-liuwei/redis,programmecat/redis,ouyangkongtong/redis,brg-liuwei/redis,takeshineshiro/redis,brg-liuwei/redis,narma/redis,a-pavlov/redis,honestme/redis,hawkchch/redis,francischan714/redis,mengyou0304/redis,rogerlz/redis,yuhc/redis-benchmark-enhanced,sunheehnus/redis,seandsky/redis,ton31337/redis,francischan714/redis,RepmujNetsik/redis,xujunhai1991/redis,mcanthony/redis,riyan8250/redis,soloestoy/redis,netroby/redis,NBSW/redis,charsyam/redis,GitHubMota/redis,healerkx/redis,xuguruogu/redis,PradheepShrinivasan/redis,YongMan/redis,clamoriniere1A/redis,pcarrier/redis,dayuoba/redis,programmecat/redis,blackmady/redis,kensou97/redis,alenslan/redis,CodeJuan/redis,jbochi/redis,mengyou0304/redis,abhiklodh/redis,Aaron1992/redis,csuhawk/redis,saisai/redis,saisai/redis,harrisonfeng/redis,programmecat/redis,mverrilli/redis,OmarQunsul/graph-redis,healerkx/redis,twskipper/redis,zhiliaoniu/redis,PKRoma/redis,nnog/redis,citusdata/redis,pkdevbox/redis,PradheepShrinivasan/redis,elkingtonmcb/redis,kensou97/redis,july2993/redis,gilala/bjredis,nnog/redis,wenxueliu/redis_comment,flashbuckets/redis,blackmady/redis,guker/redis,JoeWoo/redis,Soledad89/redis,Markgorden/redis,AplayER/redis,vincent-vivian-liu/redis,rogerchina/redis,AplayER/redis,4396/redis