Document port6 and bind6 config options.
Document port6 and bind6 config options.

Add commented port6 and bind6 options to default redis.conf file.

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