Produce fatal error when running on kernel < 3.10.0
Produce fatal error when running on kernel < 3.10.0

Running on kernel versions older than 3.10 has not been
supported for a while (as it's known to be unstable).

With the containerd integration, this has become more
apparent, because kernels < 3.4 don't support PR_SET_CHILD_SUBREAPER,
which is required for containerd-shim to run.

Change the previous "warning" to a "fatal" error, so
that we refuse to start.

There's still an escape-hatch for users by setting
"DOCKER_NOWARN_KERNEL_VERSION=1" so that they can
run "at their own risk".

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

docker/docker.github.io,lixiaobing1/docker,jameszhan/docker,mtesselH/docker,pradipd/moby,nghiant2710/docker,moul/docker,sanscontext/docker.github.io,charleszheng44/moby,LuisBosquez/docker.github.io,cloudflare/docker,mike1729/docker,dperny/docker,jvanz/docker,thaJeztah/docker,coolljt0725/docker,moby/moby,SvenDowideit/docker,tonistiigi/docker,sanjeo/docker,jongiddy/docker,dgageot/docker,BSWANG/denverdino.github.io,gnailuy/docker,yasiramin10p/moby,shin-/docker.github.io,kolyshkin/moby,abhinavdahiya/docker,runcom/docker,shubheksha/docker.github.io,stevvooe/docker,nalind/docker,joeuo/docker.github.io,mikebrow/docker,x1022as/docker,tonistiigi/docker,kojiromike/docker,sunyuan3/docker,ffoysal/docker,HideoYamauchi/docker,Mokolea/docker,fcrisciani/docker,cloudflare/docker,tklauser/docker,BSWANG/denverdino.github.io,shin-/docker.github.io,gdevillele/docker.github.io,kunalkushwaha/docker,mike1729/docker,hqhq/moby,gjaskiewicz/moby,endophage/docker,bdwill/docker.github.io,medallia/docker,Syntaxide/docker,shubheksha/docker.github.io,msabansal/docker,jthelin/docker,aduermael/docker.github.io,joaofnfernandes/docker.github.io,docker-zh/docker.github.io,pradipd/moby,lixiaobing1/docker,splunk/docker,sterchelen/docker,michelvocks/docker,xiekeyang/docker,sanscontext/docker.github.io,rillig/docker.github.io,mkumatag/docker,BenHall/docker,menglingwei/denverdino.github.io,Morsicus/docker,rremer/moby,stevvooe/docker,rhatdan/docker,darrenstahlmsft/docker,icaoweiwei/docker,catinthesky/docker,Mokolea/docker,LuisBosquez/docker.github.io,gigidwan/docker,kunalkushwaha/docker,madhanrm/docker,Altiscale/docker,johnstep/docker.github.io,djs55/docker,q384566678/docker,nawawi/docker,mikedougherty/docker,sarnautov/moby,14rcole/docker,thaJeztah/docker,prertik/docker,anujbahuguna/docker,sheimi/docker,wenchma/docker,gdevillele/docker.github.io,prertik/docker,mtesselH/docker,portworx/docker,cr7pt0gr4ph7/docker,afein/docker,dmcgowan/docker,KarthikNayak/docker,kerneltime/docker,jlebon/docker,tmp6154/docker,AkihiroSuda/docker,SvenDowideit/docker,lixiaobing10051267/docker,dccurtis/docker,docker-zh/docker.github.io,moul/docker,joeuo/docker.github.io,brahmaroutu/docker,sean-jc/docker,thaJeztah/docker.github.io,shishir-a412ed/docker,containers/storage,AkihiroSuda/docker,dperny/docker,anweiss/docker.github.io,vdemeester/docker,xiaods/docker,moypray/docker,BenHall/docker,johnstep/moby-moby,Tenk42/docker,shhsu/docker,ffoysal/docker,xuxinkun/docker,erikh/docker,xuxinkun/docker,yosifkit/docker,sdurrheimer/docker,DoraALin/docker,sean-jc/docker,laijs/moby,unclejack/docker,shin-/docker.github.io,thaJeztah/docker,13W/docker,ripcurld0/moby,kencochrane/docker,alfred-landrum/docker,joeuo/docker.github.io,troy0820/docker.github.io,anujbahuguna/docker,PatrickLang/moby,mstanleyjones/docker,phiroict/docker,anujbahuguna/docker,HuKeping/docker,kolyshkin/moby,moby/moby,srust/docker,justincormack/docker,jlebon/docker,bearstech/moby,endophage/docker,jlebon/docker,icaoweiwei/docker,dims/docker,cyphar/docker,xiekeyang/docker,JimGalasyn/docker.github.io,scotttlin/docker,moxiegirl/docker,gnailuy/docker,haveatry/docker,tophj-ibm/moby,raja-sami-10p/moby,twaugh/docker,jimjag/docker,imkin/moby,ajaymdesai/docker,isubuz/docker,denverdino/denverdino.github.io,liaoqingwei/docker,joaofnfernandes/docker.github.io,thaJeztah/docker,alfred-landrum/docker,rancher/docker,Mokolea/docker,docker-zh/docker.github.io,paralin/docker,unclejack/docker,ndeloof/docker,tianon/docker,amatsus/docker,asbjornenge/docker,docker/docker.github.io,YuPengZTE/docker,vdemeester/docker,danix800/docker.github.io,dsheets/moby,LuisBosquez/docker.github.io,tophj-ibm/docker,shhsu/docker,twaugh/docker,pramodhkp/moby,ajaymdesai/docker,tophj-ibm/moby,johnstep/docker.github.io,phiroict/docker,jwhonce/docker,Ramzec/docker,pecameron/docker,trebonian/docker,JMesser81/docker,msabansal/docker,sfsmithcha/docker,estesp/docker,menglingwei/denverdino.github.io,alfred-landrum/docker,yongtang/docker,troy0820/docker.github.io,nalind/docker,darrenstahlmsft/moby,DoraALin/docker,shin-/docker.github.io,miminar/docker,Mashimiao/docker,portworx/docker,docker/docker,troy0820/docker.github.io,KarthikNayak/docker,duglin/docker,ripcurld0/moby,noxiouz/docker,londoncalling/docker.github.io,thaJeztah/docker.github.io,mtanlee/docker,sanjeo/docker,asbjornenge/docker,yummypeng/docker,catinthesky/docker,johnstep/moby-moby,Ramzec/docker,rremer/moby,ibuildthecloud/docker,KingEmet/docker,hypriot/docker,mtanlee/docker,denverdino/docker.github.io,zhuguihua/docker,moypray/docker,xiekeyang/docker,ibuildthecloud/docker,Tenk42/docker,mkumatag/docker,Ramzec/docker,sunyuan3/docker,duglin/docker,POLJM242/docker,charleswhchan/docker,justyntemme/docker,mstanleyjones/docker,cyphar/docker,nawawi/docker,konstruktoid/docker-upstream,LaynePeng/docker,konstruktoid/docker-upstream,harche/docker,twaugh/docker,erikh/docker,willmtemple/docker,stainboy/docker,ripcurld0/moby,konstruktoid/docker-upstream,jzwlqx/denverdino.github.io,phiroict/docker,miminar/docker,laijs/docker,Morsicus/docker,moby/moby,cpuguy83/docker,tmp6154/docker,sanjeo/docker,TheBigBear/docker,xiaods/docker,danyalKhaliq10p/moby,harche/docker,mkumatag/docker,toli/docker,sunyuan3/docker,dccurtis/docker,yummypeng/docker,sheimi/docker,mahak/docker,coolljt0725/docker,tophj-ibm/moby,JimGalasyn/docker.github.io,gjaskiewicz/moby,dperny/docker,rhatdan/storage,menglingwei/denverdino.github.io,paralin/docker,msabansal/docker,flavio/docker,dongjoon-hyun/docker,joaofnfernandes/docker.github.io,dnephin/docker,charleszheng44/moby,maxamillion/docker,aduermael/docker.github.io,tonistiigi/docker,rancher/docker,denverdino/docker.github.io,mstanleyjones/docker,KingEmet/docker,denverdino/docker.github.io,brahmaroutu/docker,flavio/docker,johnstep/docker.github.io,bfirsh/docker,imkin/moby,jvanz/docker,tklauser/docker,mahak/docker,jzwlqx/denverdino.github.io,PatrickLang/moby,coreos/docker,shubheksha/docker.github.io,rremer/moby,zhuguihua/docker,nghiant2710/docker,nawawi/docker,docker/docker.github.io,Altiscale/docker,stainboy/docker,shishir-a412ed/docker,tmp6154/docker,johnstep/docker.github.io,kencochrane/docker,tkopczynski/docker,Mashimiao/docker,TheBigBear/docker,bluebreezecf/docker,naveed-jamil-tenpearls/moby,jimjag/docker,liaoqingwei/docker,nawawi/docker,mikedougherty/docker,rillig/docker.github.io,sdurrheimer/docker,jameszhan/docker,bdwill/docker.github.io,amatsus/docker,tklauser/docker,bfirsh/docker,anweiss/docker.github.io,abhinavdahiya/docker,sheimi/docker,stainboy/docker,cpuguy83/docker,HuKeping/docker,cloudflare/docker,denverdino/denverdino.github.io,shin-/docker.github.io,mtanlee/docker,HideoYamauchi/docker,sarnautov/moby,djs55/docker,kolyshkin/moby,bdwill/docker.github.io,paralin/docker,docker/docker.github.io,konstruktoid/docker-upstream,allencloud/docker,LuisBosquez/docker.github.io,runcom/docker,whuwxl/docker,resin-io/docker,yp-engineering/docker,containers/storage,x1022as/docker,anweiss/docker.github.io,kolyshkin/docker,JimGalasyn/docker.github.io,crosbymichael/docker,dgageot/docker,mohmost12/docker,sterchelen/docker,crosbymichael/docker,cyphar/docker,kojiromike/docker,gdevillele/docker.github.io,unclejack/docker,mohmost12/docker,fcrisciani/docker,portworx/docker,bearstech/moby,ColinHebert/docker,dnephin/docker,Altiscale/docker,BSWANG/denverdino.github.io,dongjoon-hyun/docker,danix800/docker.github.io,sarnautov/moby,harche/docker,estesp/docker,konstruktoid/docker-1,kerneltime/docker,Mashimiao/docker,whuwxl/docker,rhatdan/storage,ibuildthecloud/docker,yosifkit/docker,Mokolea/docker,AkihiroSuda/docker,aduermael/docker.github.io,nghiant2710/docker,thaJeztah/docker.github.io,bdwill/docker.github.io,mixja/docker,mohmost12/docker,alexisbellido/docker.github.io,pramodhkp/moby,joaofnfernandes/docker.github.io,stevvooe/docker,mahak/docker,projectatomic/docker,shhsu/docker,jvanz/docker,joaofnfernandes/docker.github.io,ColinHebert/docker,denverdino/docker.github.io,toli/docker,yp-engineering/docker,dnephin/docker,ndeloof/docker,projectatomic/docker,q384566678/docker,michelvocks/docker,cpuguy83/docker,djs55/docker,justyntemme/docker,maxamillion/docker,madhanrm/docker,mikebrow/docker,erikstmartin/docker,eskaaren/docker,resin-io/docker,JMesser81/docker,HuKeping/docker,mikedougherty/docker,denverdino/denverdino.github.io,DoraALin/docker,erikstmartin/docker,duglin/docker,naveed-jamil-tenpearls/moby,pecameron/docker,miminar/docker,cpuguy83/docker,raja-sami-10p/moby,trebonian/docker,isubuz/docker,michelvocks/docker,jongiddy/docker,yosifkit/docker,danix800/docker.github.io,13W/docker,xiaods/docker,sterchelen/docker,jlhawn/docker,Syntaxide/docker,projectatomic/docker,imkin/moby,kencochrane/docker,haveatry/docker,isubuz/docker,moxiegirl/docker,willmtemple/docker,POLJM242/docker,mtrmac/docker,raja-sami-10p/moby,yongtang/docker,kojiromike/docker,cr7pt0gr4ph7/docker,noironetworks/docker,dsau/docker,moul/docker,johnstep/docker.github.io,Syntaxide/docker,konstruktoid/docker-1,Shopify/docker,noxiouz/docker,jwhonce/docker,tagomoris/docker,hqhq/moby,erikstmartin/docker,noxiouz/docker,kunalkushwaha/docker,scotttlin/docker,shubheksha/docker.github.io,dsau/docker,coreos/docker,tophj-ibm/docker,denverdino/docker.github.io,coolljt0725/docker,yosifkit/docker,moxiegirl/docker,justyntemme/docker,sfsmithcha/docker,kerneltime/docker,x1022as/docker,gigidwan/docker,jhorwit2/docker,dims/docker,wenchma/docker,sean-jc/docker,catinthesky/docker,justincormack/docker,johnstep/moby-moby,mike1729/docker,jzwlqx/denverdino.github.io,eskaaren/docker,ibuildthecloud/docker,rillig/docker.github.io,YuPengZTE/docker,noironetworks/docker,yongtang/docker,trebonian/docker,asbjornenge/docker,gdevillele/docker.github.io,13W/docker,splunk/docker,containers/storage,Shopify/docker,SvenDowideit/docker,thtanaka/docker,BSWANG/denverdino.github.io,coreos/docker,afein/docker,rhatdan/docker,jimjag/docker,moypray/docker,moul/docker,tagomoris/docker,pramodhkp/moby,charleszheng44/moby,mikebrow/docker,ColinHebert/docker,ffoysal/docker,mtesselH/docker,JimGalasyn/docker.github.io,alexisbellido/doc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