Always use a default network if no other networks are set.
Always use a default network if no other networks are set.

also add network labels.

Signed-off-by: Daniel Nephin <6347c07ae509164cffebfb1e2a0d6ed64958db19@docker.com>

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