Add unixsocketperm note to upgrade guide
Add unixsocketperm note to upgrade guide

jirutka/gitlabhq,Telekom-PD/gitlabhq,gorgee/gitlabhq,mr-dxdy/gitlabhq,htve/GitlabForChinese,allistera/gitlabhq,bigsurge/gitlabhq,nmav/gitlabhq,ttasanen/gitlabhq,axilleas/gitlabhq,Burick/gitlabhq,shinexiao/gitlabhq,zBMNForks/gitlabhq,OlegGirko/gitlab-ce,fscherwi/gitlabhq,yonglehou/gitlabhq,ferdinandrosario/gitlabhq,htve/GitlabForChinese,daiyu/gitlab-zh,daiyu/gitlab-zh,folpindo/gitlabhq,yuyue2013/ss,cncodog/gitlab,cncodog/gitlab,nmav/gitlabhq,mente/gitlabhq,sue445/gitlabhq,aaronsnyder/gitlabhq,jrjang/gitlab-ce,Telekom-PD/gitlabhq,sekcheong/gitlabhq,johnmyqin/gitlabhq,julianengel/gitlabhq,larryli/gitlabhq,NKMR6194/gitlabhq,ibiart/gitlabhq,delkyd/gitlabhq,adaiguoguo/gitlab_globalserarch,bigsurge/gitlabhq,cui-liqiang/gitlab-ce,Telekom-PD/gitlabhq,fpgentil/gitlabhq,martijnvermaat/gitlabhq,sideci-sample/sideci-sample-gitlabhq,bbodenmiller/gitlabhq,allysonbarros/gitlabhq,yama07/gitlabhq,fendoudeqingchunhh/gitlabhq,k4zzk/gitlabhq,ksoichiro/gitlabhq,larryli/gitlabhq,fgbreel/gitlabhq,vjustov/gitlabhq,ayufan/gitlabhq,larryli/gitlabhq,fscherwi/gitlabhq,vjustov/gitlabhq,atomaka/gitlabhq,zBMNForks/gitlabhq,bbodenmiller/gitlabhq,mavimo/gitlabhq,iiet/iiet-git,ksoichiro/gitlabhq,TheWatcher/gitlabhq,chenrui2014/gitlabhq,openwide-java/gitlabhq,ayufan/gitlabhq,initiummedia/gitlabhq,stellamiranda/mobbr-gitlabhq,TheWatcher/gitlabhq,rebecamendez/gitlabhq,pulkit21/gitlabhq,darkrasid/gitlabhq,dukex/gitlabhq,yfaizal/gitlabhq,mrb/gitlabhq,cui-liqiang/gitlab-ce,cui-liqiang/gitlab-ce,liyakun/gitlabhq,k4zzk/gitlabhq,delkyd/gitlabhq,rhels/gitlabhq,Burick/gitlabhq,yama07/gitlabhq,rumpelsepp/gitlabhq,OtkurBiz/gitlabhq,mmkassem/gitlabhq,cinderblock/gitlabhq,Tyrael/gitlabhq,stanhu/gitlabhq,OlegGirko/gitlab-ce,gorgee/gitlabhq,dukex/gitlabhq,ibiart/gitlabhq,it33/gitlabhq,dplarson/gitlabhq,flashbuckets/gitlabhq,salipro4ever/gitlabhq,wangcan2014/gitlabhq,Datacom/gitlabhq,jirutka/gitlabhq,mavimo/gitlabhq,openwide-java/gitlabhq,Kambda/Mobbr,8thcolor/testing-public-gitlabhq,liyakun/gitlabhq,salipro4ever/gitlabhq,htve/GitlabForChinese,yatish27/gitlabhq,martinma4/gitlabhq,daiyu/gitlab-zh,flashbuckets/gitlabhq,bigsurge/gitlabhq,johnmyqin/gitlabhq,julianengel/gitlabhq,jvanbaarsen/gitlabhq,since2014/gitlabhq,martijnvermaat/gitlabhq,SVArago/gitlabhq,tempbottle/gitlabhq,manfer/gitlabhq,t-zuehlsdorff/gitlabhq,hzy001/gitlabhq,mrb/gitlabhq,initiummedia/gitlabhq,cinderblock/gitlabhq,pulkit21/gitlabhq,fscherwi/gitlabhq,sue445/gitlabhq,fantasywind/gitlabhq,MauriceMohlek/gitlabhq,htve/GitlabForChinese,luzhongyang/gitlabhq,phinfonet/mobbr-gitlabhq,MauriceMohlek/gitlabhq,williamherry/gitlabhq,8thcolor/testing-public-gitlabhq,8thcolor/testing-public-gitlabhq,ikappas/gitlabhq,revaret/gitlabhq,stoplightio/gitlabhq,duduribeiro/gitlabhq,williamherry/gitlabhq,ordiychen/gitlabhq,michaKFromParis/sparkslab,whluwit/gitlabhq,joalmeid/gitlabhq,cui-liqiang/gitlab-ce,MauriceMohlek/gitlabhq,koreamic/gitlabhq,jrjang/gitlabhq,pjknkda/gitlabhq,jaepyoung/gitlabhq,Soullivaneuh/gitlabhq,adaiguoguo/gitlab_globalserarch,fendoudeqingchunhh/gitlabhq,gopeter/gitlabhq,zBMNForks/gitlabhq,mavimo/gitlabhq,sue445/gitlabhq,icedwater/gitlabhq,WSDC-NITWarangal/gitlabhq,windymid/test2,t-zuehlsdorff/gitlabhq,ikappas/gitlabhq,martinma4/gitlabhq,iiet/iiet-git,fearenales/gitlabhq,childbamboo/gitlabhq,revaret/gitlabhq,theodi/gitlabhq,chenrui2014/gitlabhq,duduribeiro/gitlabhq,michaKFromParis/gitlabhq,kemenaran/gitlabhq,whluwit/gitlabhq,martinma4/gitlabhq,stellamiranda/mobbr-gitlabhq,Razer6/gitlabhq,sonalkr132/gitlabhq,pulkit21/gitlabhq,ZeoAlliance/gitlabhq,michaKFromParis/gitlabhq,per-garden/gitlabhq,koreamic/gitlabhq,ttasanen/gitlabhq,OlegGirko/gitlab-ce,H3Chief/gitlabhq,jrjang/gitlab-ce,dvrylc/gitlabhq,stanhu/gitlabhq,hq804116393/gitlabhq,Kambda/Mobbr,szechyjs/gitlabhq,chadyred/gitlabhq,cncodog/gitlab,it33/gitlabhq,nmav/gitlabhq,Exeia/gitlabhq,michaKFromParis/sparkslab,eliasp/gitlabhq,phinfonet/mobbr-gitlabhq,michaKFromParis/gitlabhqold,Razer6/gitlabhq,dwrensha/gitlabhq,mmkassem/gitlabhq,fgbreel/gitlabhq,tim-hoff/gitlabhq,manfer/gitlabhq,Soullivaneuh/gitlabhq,SVArago/gitlabhq,stoplightio/gitlabhq,NKMR6194/gitlabhq,zBMNForks/gitlabhq,it33/gitlabhq,Kambda/mobbr-gitlabhq,darkrasid/gitlabhq,joalmeid/gitlabhq,dukex/gitlabhq,theonlydoo/gitlabhq,TheWatcher/gitlabhq,ttasanen/gitlabhq,copystudy/gitlabhq,k4zzk/gitlabhq,darkrasid/gitlabhq,rhels/gitlabhq,sakishum/gitlabhq,yulchitaj/TEST3,wangcan2014/gitlabhq,hzy001/gitlabhq,luzhongyang/gitlabhq,julianengel/gitlabhq,icedwater/gitlabhq,zrbsprite/gitlabhq,bigsurge/gitlabhq,TheWatcher/gitlabhq,vjustov/gitlabhq,dvrylc/gitlabhq,stanhu/gitlabhq,kemenaran/gitlabhq,per-garden/gitlabhq,since2014/gitlabhq,Razer6/gitlabhq,bozaro/gitlabhq,chadyred/gitlabhq,theonlydoo/gitlabhq,theodi/gitlabhq,gopeter/gitlabhq,ferdinandrosario/gitlabhq,yonglehou/gitlabhq,mmkassem/gitlabhq,Datacom/gitlabhq,jrjang/gitlabhq,OtkurBiz/gitlabhq,dreampet/gitlab,sekcheong/gitlabhq,it33/gitlabhq,dwrensha/gitlabhq,DanielZhangQingLong/gitlabhq,louahola/gitlabhq,per-garden/gitlabhq,nguyen-tien-mulodo/gitlabh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