fix when rpc reports "transport is closing" error, health check go routine will exit
fix when rpc reports "transport is closing" error, health check go routine will exit

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

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