Fix validation of plugins without rootfs in config
Fix validation of plugins without rootfs in config

Signed-off-by: Tonis Tiigi <c2470c48b2d3312d61f94f18d3a1cd113d1915ad@gmail.com>
mkumatag/docker,gjaskiewicz/moby,allencloud/docker,miminar/docker,scotttlin/docker,coreos/docker,catinthesky/docker,danyalKhaliq10p/moby,unclejack/docker,nalind/docker,jameszhan/docker,flavio/docker,thaJeztah/docker,kolyshkin/docker,unclejack/docker,lixiaobing10051267/docker,x1022as/docker,KarthikNayak/docker,danyalKhaliq10p/moby,dgageot/docker,nawawi/docker,charleszheng44/moby,dccurtis/docker,fcrisciani/docker,darrenstahlmsft/docker,shishir-a412ed/docker,resin-io/docker,tophj-ibm/moby,kolyshkin/moby,konstruktoid/docker-upstream,paralin/docker,haveatry/docker,prertik/docker,q384566678/docker,rhatdan/docker,HideoYamauchi/docker,yasiramin10p/moby,KarthikNayak/docker,whuwxl/docker,AkihiroSuda/docker,mtesselH/docker,Mokolea/docker,cpuguy83/docker,xuxinkun/docker,jlhawn/docker,ibuildthecloud/docker,x1022as/docker,madhanrm/docker,coolljt0725/docker,rremer/moby,ColinHebert/docker,tklauser/docker,mstanleyjones/docker,paralin/docker,amatsus/docker,Syntaxide/docker,ndeloof/docker,coreos/docker,AkihiroSuda/docker,Ramzec/docker,lixiaobing1/docker,moul/docker,crosbymichael/docker,liaoqingwei/docker,sterchelen/docker,Ramzec/docker,tophj-ibm/docker,fcrisciani/docker,mahak/docker,thtanaka/docker,maxamillion/docker,nalind/docker,PatrickLang/moby,jimjag/docker,noironetworks/docker,dims/docker,shishir-a412ed/docker,liaoqingwei/docker,alfred-landrum/docker,amatsus/docker,yongtang/docker,hqhq/moby,bonczj/moby-json-file-logger,erikh/docker,SvenDowideit/docker,tophj-ibm/moby,AkihiroSuda/docker,yosifkit/docker,rancher/docker,erikstmartin/docker,bonczj/moby-json-file-logger,tklauser/docker,laijs/docker,kencochrane/docker,cpuguy83/docker,jthelin/docker,nawawi/docker,catinthesky/docker,rhatdan/docker,mstanleyjones/docker,catinthesky/docker,erikh/docker,naveed-jamil-tenpearls/moby,thaJeztah/docker,mahak/docker,yosifkit/docker,moypray/docker,KarthikNayak/docker,mtesselH/docker,ibuildthecloud/docker,justincormack/docker,AkihiroSuda/docker,ColinHebert/docker,shhsu/docker,JMesser81/docker,Syntaxide/docker,haveatry/docker,danyalKhaliq10p/moby,paralin/docker,coreos/docker,JMesser81/docker,moypray/docker,duglin/docker,moul/docker,kencochrane/docker,KingEmet/docker,prertik/docker,shhsu/docker,sarnautov/moby,pradipd/moby,thtanaka/docker,michael-holzheu/docker,jwhonce/docker,flavio/docker,cyphar/docker,raja-sami-10p/moby,jlhawn/docker,flavio/docker,trebonian/docker,erikh/docker,noironetworks/docker,xuxinkun/docker,noironetworks/docker,ibuildthecloud/docker,KingEmet/docker,Ramzec/docker,michael-holzheu/docker,trebonian/docker,rremer/moby,jimjag/docker,srust/docker,allencloud/docker,cyphar/docker,jameszhan/docker,mahak/docker,lixiaobing10051267/docker,liaoqingwei/docker,darrenstahlmsft/moby,tophj-ibm/docker,yongtang/docker,scotttlin/docker,kolyshkin/moby,rhatdan/docker,akira-baruah/docker,sterchelen/docker,mikedougherty/docker,estesp/docker,kojiromike/docker,moby/moby,darrenstahlmsft/moby,vdemeester/docker,gschaetz/moby,whuwxl/docker,jameszhan/docker,darrenstahlmsft/moby,kojiromike/docker,gschaetz/moby,thaJeztah/docker,sterchelen/docker,jimjag/docker,justincormack/docker,diogomonica/docker,qudongfang/docker,ibuildthecloud/docker,dsheets/moby,moby/moby,HideoYamauchi/docker,Mokolea/docker,bearstech/moby,PatrickLang/moby,raja-sami-10p/moby,tonistiigi/docker,yongtang/docker,diogomonica/docker,ndeloof/docker,shishir-a412ed/docker,laijs/moby,nawawi/docker,charleszheng44/moby,thaJeztah/docker,nawawi/docker,ColinHebert/docker,tmp6154/docker,madhanrm/docker,dccurtis/docker,dperny/docker,Syntaxide/docker,coolljt0725/docker,bearstech/moby,dperny/docker,PatrickLang/moby,amatsus/docker,naveed-jamil-tenpearls/moby,pradipd/moby,pradipd/moby,konstruktoid/docker-upstream,johnstep/moby-moby,konstruktoid/docker-upstream,michael-holzheu/docker,resin-io/docker,SvenDowideit/docker,fcrisciani/docker,konstruktoid/docker-upstream,mtesselH/docker,q384566678/docker,tonistiigi/docker,mixja/docker,gnailuy/docker,gnailuy/docker,yummypeng/docker,YuPengZTE/docker,miminar/docker,tianon/docker,yosifkit/docker,YuPengZTE/docker,rancher/docker,bonczj/moby-json-file-logger,cpuguy83/docker,crosbymichael/docker,diogomonica/docker,ripcurld0/moby,erikstmartin/docker,srust/docker,mixja/docker,tianon/docker,moby/moby,raja-sami-10p/moby,jwhonce/docker,trebonian/docker,darrenstahlmsft/docker,dgageot/docker,mstanleyjones/docker,kencochrane/docker,gschaetz/moby,erikstmartin/docker,rremer/moby,imkin/moby,maxamillion/docker,paralin/docker,docker/docker,duglin/docker,tonistiigi/docker,dsheets/moby,hqhq/moby,ripcurld0/moby,resin-io/docker,ffoysal/docker,laijs/docker,miminar/docker,docker/docker,kolyshkin/docker,estesp/docker,Ramzec/docker,johnstep/moby-moby,prertik/docker,yummypeng/docker,dmcgowan/docker,mixja/docker,laijs/moby,dmcgowan/docker,ffoysal/docker,tmp6154/docker,mikebrow/docker,flavio/docker,dmcgowan/docker,jvanz/docker,ripcurld0/moby,pramodhkp/moby,whuwxl/docker,xuxinkun/docker,HideoYamauchi/docker,hqhq/moby,mkumatag/docker,mkumatag/docker,SvenDowideit/docker,gnailuy/docker,KingEmet/docker,konstruktoid/docker-1,haveatry/docker,yasiramin10p/moby,jlhawn/docker,jvanz/docker,moul/docker,mikebrow/docker,pramodhkp/moby,djs55/docker,mikedougherty/docker,unclejack/docker,gnailuy/docker,mike1729/docker,POLJM242/docker,rancher/docker,yosifkit/docker,alfred-landrum/docker,djs55/docker,tmp6154/docker,nalind/docker,sarnautov/moby,scotttlin/docker,yummypeng/docker,tophj-ibm/moby,ffoysal/docker,imkin/moby,lixiaobing10051267/docker,imkin/moby,konstruktoid/docker-1,shhsu/docker,vdemeester/docker,bearstech/moby,madhanrm/docker,lixiaobing1/docker,JMesser81/docker,maxamillion/docker,trebonian/docker,akira-baruah/docker,allencloud/docker,johnstep/moby-moby,qudongfang/docker,mikedougherty/docker,ndeloof/docker,sdurrheimer/docker,dims/docker,kojiromike/docker,Mokolea/docker,pramodhkp/moby,coolljt0725/docker,laijs/docker,estesp/docker,darrenstahlmsft/docker,jvanz/docker,YuPengZTE/docker,tklauser/docker,srust/docker,dims/docker,ibuildthecloud/docker,moypray/docker,konstruktoid/docker-1,kolyshkin/moby,cpuguy83/docker,duglin/docker,cyphar/docker,lixiaobing1/docker,vdemeester/docker,dgageot/docker,dsheets/moby,POLJM242/docker,mikebrow/docker,gjaskiewicz/moby,tophj-ibm/docker,alfred-landrum/docker,docker/docker,justincormack/docker,thtanaka/docker,x1022as/docker,q384566678/docker,yasiramin10p/moby,jthelin/docker,dperny/docker,qudongfang/docker,mahak/docker,bearstech/moby,moby/moby,naveed-jamil-tenpearls/moby,jwhonce/docker,mike1729/docker,sarnautov/moby,Mokolea/docker,moul/docker,dccurtis/docker,jimjag/docker,sdurrheimer/docker,djs55/docker,nalind/docker,gjaskiewicz/moby,laijs/moby,sdurrheimer/docker,mike1729/docker,charleszheng44/moby,crosbymichael/docker