Fix docker save with empty timestamp of layer created time
Fix docker save with empty timestamp of layer created time

Signed-off-by: Lei Jitang <9ac444d2b5df3db1f31aa1c6462ac8e9e2bde241@huawei.com>

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