error out if checkpoint specified on non-experimental
error out if checkpoint specified on non-experimental

Signed-off-by: Brian Goff <dc73d0991b982a8303e713ef531a313af77e242a@gmail.com>

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