Bash completion for `docker node update` completes only one node
Bash completion for `docker node update` completes only one node

`docker node update` accepts only one node.
Before this change, bash completion would complete additional nodes.

Signed-off-by: Harald Albers <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@albersweb.de>

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