fix client.Transport
fix client.Transport

`client.Transport` is `http.Client.Transport` just has `RoundTripper()`. Not `http.Transport`. So we cannot convert it here.

For a mock test, I can play with this https://play.golang.org/p/gs7_QrL9-Y

Signed-off-by: wrfly <d75e2b16b8f2e81454614b2d16a1ccad68684b40@gmail.com>

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