Sentinel: don't detect duplicated Sentinels, just address switch
Sentinel: don't detect duplicated Sentinels, just address switch

Since with a previous commit Sentinels now persist their unique ID, we
no longer need to detect duplicated Sentinels and re-add them. We remove
and re-add back using different events only in the case of address
switch of the same Sentinel, without generating a new +sentinel event.

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sai/redis,duanx/redis,AALEKH/redis,shreesundara/redis,valdsJohn/redis,zhcy/redis,davidradunz/redis,tanghaodong25/redis,linfangrong/redis,allengaller/redis,ErikDubbelboer/redis,mengyou0304/redis,hornen/redis,badboy/redis,mingyaaaa/redis,elkingtonmcb/redis,simplestbest/redis,arijitvt/redis,GrimDerp/redis,AplayER/redis,Sciumo/redis,zguangyu/redis,july2993/redis,ton31337/redis,jingjidejuren/redis,brg-liuwei/redis,rouzier/redis,wenxueliu/redis_comment,cusspvz/redis,duanx/redis,YuraLukashik/redis,takeshineshiro/redis,supasate/redis,Aliceljm1/redis,Sciumo/redis,pcarrier/redis,vincent-vivian-liu/redis,programmecat/redis,PradheepShrinivasan/redis,rouzier/redis,itamarhaber/redis,YuanZhewei/redis,healerkx/redis,wangyikai/redis,GrimDerp/redis,janekmi/redis,GrimDerp/redis,taoguan/redis,tellapart/redis,Markgorden/redis,JoeWoo/redis,clamoriniere1A/redis,LongXQ/redis,SummonY/redis,riyan8250/redis,CodeJuan/redis,yossigo/redis,itugs/redis,sunheehnus/redis,csuhawk/redis,holstvoogd/redis,universsky/redis,thomasdarimont/redis,wprice/redis,hgl888/redis,SyntaxStacks/redis,z-fork/redis,AALEKH/redis,ipmobiletech/redis,programmecat/redis,YongMan/redis,ton31337/redis,z-fork/redis,weizijun/redis,hedisdb/hedis,MasahikoSawada/redis,riyan8250/redis,Aliceljm1/redis,Markgorden/redis,janekmi/redis,wenxueliu/redis_comment,AplayER/redis,cnbin/redis,guker/redis,dreamquster/redis,tellapart/redis,brg-liuwei/redis,netroby/redis,ofirluzon/redis,seppo0010/redis,seandsky/redis,tjschuck/redis,Wangyao14cyy/redis,ofirluzon/redis,kaushik94/redis,ErikDubbelboer/redis,hedisdb/hedis,h0x91b/redis,seandsky/redis,arijitvt/redis,wangyikai/redis,xlzhan/redis,wbailey5/redis,AALEKH/redis,flashbuckets/redis,pkdevbox/redis,kensou97/redis,spinlock/redis,dreamquster/redis,4396/redis,ctripcorp/redis,pedigree/redis,itugs/redis,wangyikai/redis,arijitvt/redis,jackyan/redis,cloudrain21/redis,aim-for-better/redis,qiyang0221/redis,gaoxianglong/redis,blackmady/redis,neomantra/redis,linfangrong/redis,hawkchch/redis,twskipper/redis,valdsJohn/redis,ctripcorp/redis,riyan8250/redis,sunheehnus/redis,shining-yang/redis,cusspvz/redis,rouzier/redis,weizijun/redis,saisai/redis,hgl888/redis,YongMan/redis,csuhawk/redis,supasate/redis,zczhuohuo/redis,mengyou0304/redis,mverrilli/redis,charsyam/redis,charsyam/redis,rouzier/redis,spinlock/redis,shining-yang/redis,francischan714/redis,zhcy/redis,Markgorden/redis,honestme/redis,valdsJohn/redis,190235047/redis,july2993/redis,tjschuck/redis,twskipper/redis,xujunhai1991/redis,190235047/redis,ytjiang/redis,antirez/redis,wbailey5/redis,healerkx/redis,izhoujie/redis,yuhc/redis-benchmark-enhanced,atreeyang/redis,weizijun/redis,a-pavlov/redis,hawkchch/redis,ofirluzon/redis,mingyaaaa/redis,SyntaxStacks/redis,davidradunz/redis,xujunhai1991/redis,wprice/redis,Soledad89/redis,mumingv/redis,devaos/redis,jingjidejuren/redis,a-pavlov/redis,hornen/redis,soloestoy/redis,janekmi/redis,vincent-vivian-liu/redis,ipmobiletech/redis,itugs/redis,rogerlz/redis,LongXQ/redis,yuhc/redis-benchmark-enhanced,csuhawk/redis,cnbin/redis,antirez/redis,OmarQunsul/graph-redis,rogerchina/redis,honestme/redis,izhoujie/redis,xuguruogu/redis,neomantra/redis,guker/redis,mcanthony/redis,linfangrong/redis,kmiku7/redis,xlzhan/redis,fengshao0907/redis,StevenTsai/redis,saisai/redis,AplayER/redis,yossigo/redis,zhiliaoniu/redis,4396/redis,PradheepShrinivasan/redis,charsyam/redis,guker/redis,GitHubMota/redis,huyuezheng/redis,aim-for-better/redis,PKRoma/redis,mumingv/redis,taoguan/redis,rogerlz/redis,wprice/redis,yuhc/redis-benchmark-enhanced,hornen/redis,davidradunz/redis,Aliceljm1/redis,guker/redis,soveran/redis,YuanZhewei/redis,LongXQ/redis,atreeyang/redis,zhiliaoniu/redis,colstrom/redis,cusspvz/redis,AplayER/redis,huyuezheng/redis,thomasdarimont/redis,neomantra/redis,brg-liuwei/redis,arijitvt/redis,twskipper/redis,nnog/redis,xuguruogu/redis,seandsky/redis,elkingtonmcb/redis,mgk/redis,itamarhaber/redis,a-pavlov/redis,neomantra/redis,cloudrain21/redis,soloestoy/redis,SummonY/redis,antirez/redis