Fix when containerd restarted, event handler may exit
Fix when containerd restarted, event handler may exit

Description:
Kill docker-containerd continuously, and use kill -SIGUSR1 <dockerpid>
to check docker callstacks. And we will find that event
handler: startEventsMonitor or handleEventStream will exit.

This will only happen when system is busy, containerd need more time to
startup, and the monitor gorotine maybe exit.

Signed-off-by: Wentao Zhang <1f81ed848dd279299c89d57647e67fb988aa75e2@huawei.com>

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