Fix S3 driver's list when the root directory is either "" or "/"
Fix S3 driver's list when the root directory is either "" or "/"

jordimassaguerpla/distribution,lcarstensen/distribution,schu/distribution,denverdino/docker.github.io,danix800/docker.github.io,ChenLingPeng/distribution,jackpgriffin/distribution,aduermael/docker.github.io,uptownhr/distribution,gavioto/distribution,humble00/distribution,alexisbellido/docker.github.io,jonboulle/distribution,docker/docker.github.io,anweiss/docker.github.io,dtromb/distribution,joeuo/docker.github.io,avinson/distribution,sergeyfd/distribution,wangmingshuai/distribution,LuisBosquez/docker.github.io,arvindkandhare/distribution,codefresh-io/cf-distribution,curtiszimmerman/distribution,huamai-io/distribution,BSWANG/denverdino.github.io,ContainerSolutions/distribution,troy0820/docker.github.io,dalanlan/distribution,manoj535/distribution,bdwill/docker.github.io,anweiss/docker.github.io,atyenoria/distribution,AoJ/distribution,johnstep/docker.github.io,bdwill/docker.github.io,docker-zh/docker.github.io,tian-xiaobo/distribution,orivej/distribution,shubheksha/docker.github.io,bsmr-docker/distribution,beni55/distribution,linearregression/distribution,denverdino/docker.github.io,avinson/distribution,sallyom/distribution,gdevillele/docker.github.io,gdevillele/docker.github.io,nateww/distribution,docker/distribution,docker-zh/docker.github.io,13W/distribution,bpradipt/distribution,nevermosby/distribution,arneluehrs/distribution,paulczar/distribution,vdemeester/distribution,denverdino/distribution,rochacon/distribution,shin-/docker.github.io,Tiesheng/distribution,djenriquez/distribution,sadlil/distribution,GerritForge/docker-registry,anweiss/docker.github.io,ibuildthecloud/distribution,phiroict/docker,estesp/distribution,gavioto/distribution,rodacom/docker-hub,gierschv/distribution,rbarlow/distribution,bdwill/docker.github.io,shin-/docker.github.io,danix800/docker.github.io,troy0820/docker.github.io,zhaytee/distribution,Seb-Solon/distribution,noxiouz/distribution,alexisbellido/docker.github.io,danix800/docker.github.io,manoj535/distribution,lcarstensen/distribution,nwt/distribution,Gobliip/distribution,armbuilds/distribution,lorieri/distribution,tdooner/distribution,londoncalling/docker.github.io,docker-zh/docker.github.io,BrickXu/distribution,gdevillele/docker.github.io,phiroict/docker,phiroict/docker,humble00/distribution,calavera/distribution,gorcz/distribution,konnase/distribution,djenriquez/distribution,zerosign/distribution,jzwlqx/denverdino.github.io,jlhawn/distribution,thaJeztah/docker.github.io,baloo/distribution,Gobliip/distribution,londoncalling/docker.github.io,aybabtme/distribution,rillig/docker.github.io,mbentley/distribution,mattmoor/distribution,endophage/distribution,runcom/distribution,dalanlan/distribution,phiroict/docker,denverdino/denverdino.github.io,joaofnfernandes/docker.github.io,convox/distribution,xiekeyang/distribution,pdevine/distribution,docker/docker.github.io,BSWANG/denverdino.github.io,BSWANG/denverdino.github.io,CodeJuan/distribution,yuwaMSFT2/distribution,jwhonce/distribution,uptownhr/distribution,endophage/distribution,jpoler/distribution,arneluehrs/distribution,dmcgowan/distribution,BradleyA/distribution,amitshukla/distribution,dobril-stanga/distribution,jzwlqx/denverdino.github.io,schu/distribution,adambrett-forks/distribution,jzwlqx/distribution,maquanyi/distribution,n1tr0g/distribution,jonboulle/distribution,CodeJuan/distribution,armbuilds/distribution,maquanyi/distribution,qiniu/distribution,LouisKottmann/distribution,spacexnice/distribution,orivej/distribution,harche/distribution,curtiszimmerman/distribution,thaJeztah/docker.github.io,tt/distribution,thaJeztah/distribution,lindenlab/distribution,championv/distribution,alexisbellido/docker.github.io,docker/docker.github.io,tdooner/distribution,sanscontext/docker.github.io,cezarsa/distribution,liubin/distribution,sthapaun/distribution,denverdino/distribution-fuse,13W/distribution,rodacom/docker-hub,dtromb/distribution,konstruktoid/distribution,thaJeztah/docker.github.io,moxiegirl/distribution,bpradipt/distribution,cyli/distribution,andrewnguyen/distribution,gorcz/distribution,mikebrow/distribution,higebu/distribution,JimGalasyn/docker.github.io,londoncalling/docker.github.io,calavera/distribution,shubheksha/docker.github.io,yuwaMSFT2/distribution,n1tr0g/distribution,genedock/distribution,joeuo/docker.github.io,denverdino/docker.github.io,aduermael/docker.github.io,dave-tucker/distribution,BSWANG/denverdino.github.io,LuisBosquez/docker.github.io,joeuo/docker.github.io,apuigsech/distribution,hopkings2008/distribution,joaofnfernandes/docker.github.io,dmp42/distribution,troy0820/docker.github.io,moxiegirl/distribution,londoncalling/docker.github.io,lebauce/distribution,sallyom/distribution,miminar/distribution,LouisKottmann/distribution,RaviTezu/distribution,jmitchell/distribution,zhangcoldwater/distribution,ContainerSolutions/distribution,jzwlqx/denverdino.github.io,RichardScothern/distribution,tt/distribution,bigsurge/distribution,denverdino/distribution-stevvooe,deis/distribution,shin-/docker.github.io,dobril-stanga/distribution,huamai-io/distribution,aaronlehmann/distribution,thaJeztah/distribution,harche/distribution,jzwlqx/denverdino.github.io,paulczar/distribution,bxy09/distribution,baloo/distribution,iskradelta/distribution,kmala/distribution,hpcloud/distribution,mattmoor/distribution,joaofnfernandes/docker.github.io,jramseye/distribution,zerosign/distribution,tschoots/distribution,nateww/distribution,mboersma/distribution,adambrett-forks/distribution,joeuo/docker.github.io,jhicks-camgian/distribution,BrianBland/distribution,sthapaun/distribution,nwt/distribution,kmala/distribution,thelinuxkid/distribution,lebauce/distribution,jackpgriffin/distribution,jrjang/distribution,iskradelta/distribution,Tiesheng/distribution,denverdino/distribution-fuse,jramseye/distribution,deis/distribution,tschoots/distribution,pdevine/distribution,danix800/docker.github.io,hopkings2008/distribution,rillig/docker.github.io,alexisbellido/docker.github.io,shyr/distribution,jrjang/distribution,BrianBland/distribution,zhangcoldwater/distribution,nevermosby/distribution,lindenlab/distribution,shubheksha/docker.github.io,whyrusleeping/distribution,denverdino/distribution,menglingwei/denverdino.github.io,docker/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io,irachex/distribution,xiekeyang/distribution,apuigsech/distribution,anweiss/docker.github.io,menglingwei/denverdino.github.io,mattrgreen/distribution,JimGalasyn/docker.github.io,hanleys/distribution,GerritForge/docker-registry,bobphill/distribution,docker-zh/docker.github.io,jpoler/distribution,beni55/distribution,RyanDeng/distribution,duglin/distribution,linearregression/distribution,gierschv/distribution,spacexnice/distribution,mattrgreen/distribution,zhaytee/distribution,JimGalasyn/docker.github.io,jmitchell/distribution,aduermael/docker.github.io,menglingwei/denverdino.github.io,LuisBosquez/docker.github.io,denverdino/denverdino.github.io,bxy09/distribution,thaJeztah/docker.github.io,harrisonfeng/distribution,BrickXu/distribution,qiniu/distribution,sebrandon1/distribution,denverdino/denverdino.github.io,docker/distribution,stevvooe/distribution,alexisbellido/docker.github.io,JimGalasyn/docker.github.io,jhicks-camgian/distribution,anweiss/docker.github.io,sanscontext/docker.github.io,dave-tucker/distribution,bdwill/docker.github.io,rhoml/distribution,docker-zh/docker.github.io,sanscontext/docker.github.io,estesp/distribution,arvindkandhare/distribution,bobphill/distribution,gdevillele/docker.github.io,stevvooe/distribution,rhoml/distribution,johnstep/docker.github.io,jwhonce/distribution,BSWANG/denverdino.github.io,denverdino/docker.github.io,lorieri/distribution,aprajshekhar/distribution,gdevillele/docker.github.io,duglin/distribution,championv/distribution,Seb-Solon/distribution,noxiouz/distribution,dmcgowan/distribution,shin-/docker.github.io,wking/docker-distribution,LuisBosquez/docker.github.io,aduermael/docker.github.io,rochacon/distribution,whyrusleeping/distribution,BradleyA/distribution,RyanDeng/distribution,dmp42/distribution,joaofnfernandes/docker.github.io,shin-/docker.github.io,jzwlqx/denverdino.github.io,irachex/distribution,menglingwei/denverdino.github.io,johnstep/docker.github.io,liubin/distribution,sergeyfd/distribution,sanscontext/docker.github.io,denverdino/distribution-stevvooe,rillig/docker.github.io,runcom/distribution,thaJeztah/docker.github.io,AoJ/distribution,dv/distribution,JimGalasyn/docker.github.io,konstruktoid/distribution,imranraja85/distribution,LuisBosquez/docker.github.io,aibaars/distribution,konnase/distribution,andrewnguyen/distribution,joaofnfernandes/docker.github.io,ChenLingPeng/distribution,rillig/docker.github.io,higebu/distribution,ibuildthecloud/distribution,shyr/distribution,harrisonfeng/distribution,denverdino/docker.github.io,dv/distribution,rbarlow/distribution,amitshukla/distribution,jlhawn/distribution,denverdino/denverdino.github.io,johnstep/docker.github.io,denverdino/denverdino.github.io,phiroict/docker,miminar/distribution,menglingwei/denverdino.github.io,aibaars/distribution,yeghishe/distribution,yeghishe/distribution,bsmr-docker/distribution,jzwlqx/distribution,atyenoria/distribution,cyli/distribution,sanscontext/docker.github.io,imranraja85/distribution,sadlil/distribution,cezarsa/distribution,shubheksha/docker.github.io,RichardScothern/distribution,bdwill/docker.github.io,convox/distribution,mikebrow/distribution,sebrandon1/distribution,hanleys/distribution,codefresh-io/cf-distribution,hpcloud/distribution,troy0820/docker.github.io,aprajshekhar/distribution,RaviTezu/distribution,vdemeester/distribution,joeuo/docker.github.io,wangmingshuai/distribution,aybabtme/distribution,thelinuxkid/distribution,johnstep/docker.github.io,shubheksha/docker.github.io,tian-xiaobo/distribution,bigsurge/distribution,mboersma/distribution,mbentley/distribution,wking/docker-distribution,jordimassaguerpla/distribution,genedock/distribution,aaronlehmann/distribution