Support usage messages on bad flags.
Support usage messages on bad flags.

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

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