cluster: Renew the context after communicating with the registry
cluster: Renew the context after communicating with the registry

When pinning by digest, the registry might be slow or unresponsive. This
could cause the context to already be expired by the time UpdateService
or CreateService is called. We want digest pinning to be a best-effort
operation, so it's problematic if a slow or misbehaving registry
prevents the service operation from completing. Replace the context
after communicating with the registry, so we have a fresh timeout for
the gRPC call.

Signed-off-by: Aaron Lehmann <8ecfc6017a87905413dcd7d63696a2a4c351b604@docker.com>

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