added cleanup for extension containers upon extension removal
added cleanup for extension containers upon extension removal

tombee/shipyard,bkcsoft/shipyard,daququ/shipyard,jsyinwenjun/shipyard,svdata/shipyard,John-Lin/shipyard,golang-lib/shipyard,tombee/shipyard,ehazlett/shipyard,swege/shipyard,swege/shipyard,RustJason/shipyard,RustJason/shipyard,daququ/shipyard,rockzeng/shipyard,scapewang/shipyard,Lev09/shipyard,scapewang/shipyard,dockerclubgroup/shipyard,eedevops/shipyard,chenrui2014/shipyard,zhoffice/shipyard,rchicoli/shipyard,tombee/shipyard,Lev09/shipyard,linecheng/shipyard,pugna0/shipyard,rockzeng/shipyard,John-Lin/shipyard,leroy-chen/shipyard,leroy-chen/shipyard,leominov/shipyard,rchicoli/shipyard,Dumbear/shipyard,ehazlett/shipyard,zhiwei55/shipyard,rbramwell/shipyard,linecheng/shipyard,Dumbear/shipyard,LongTaiJun/DockerUI,scapewang/shipyard,zhiwei55/shipyard,vanloswang/shipyard,rchicoli/shipyard,iamjakob/shipyard,rbramwell/shipyard,wujingke/shipyard,swege/shipyard,linecheng/shipyard,dockerclubgroup/shipyard,bkcsoft/shipyard,daququ/shipyard,chenrui2014/shipyard,leroy-chen/shipyard,zhoffice/shipyard,vanloswang/shipyard,RustJason/shipyard,Dumbear/shipyard,eedevops/shipyard,swege/shipyard,OnePaaS/shipyard,wujingke/shipyard,rbramwell/shipyard,zhoffice/shipyard,jsyinwenjun/shipyard,leroy-chen/shipyard,rockzeng/shipyard,LongTaiJun/DockerUI,LongTaiJun/DockerUI,beyondblog/shipyard,jsyinwenjun/shipyard,John-Lin/shipyard,iamjakob/shipyard,bkcsoft/shipyard,beyondblog/shipyard,dockerclubgroup/shipyard,iamjakob/shipyard,RustJason/shipyard,jsyinwenjun/shipyard,chenrui2014/shipyard,beyondblog/shipyard,pugna0/shipyard,svdata/shipyard,daququ/shipyard,ehazlett/shipyard,linecheng/shipyard,LongTaiJun/DockerUI,John-Lin/shipyard,rbramwell/shipyard,golang-lib/shipyard,bkcsoft/shipyard,golang-lib/shipyard,chenrui2014/shipyard,zhoffice/shipyard,eedevops/shipyard,scapewang/shipyard,leominov/shipyard,vanloswang/shipyard,tombee/shipyard,Lev09/shipyard,OnePaaS/shipyard,leominov/shipyard,iamjakob/shipyard,ehazlett/shipyard,vanloswang/shipyard,wujingke/shipyard,rchicoli/shipyard,leominov/shipyard,zhiwei55/shipyard,beyondblog/shipyard,rockzeng/shipyard,Lev09/shipyard,dockerclubgroup/shipyard,golang-lib/shipyard,OnePaaS/shipyard,pugna0/shipyard,svdata/shipyard,Dumbear/shipyard,eedevops/shipyard,wujingke/shipyard,OnePaaS/shipyard,pugna0/shipyard,svdata/shipyard,zhiwei55/shipyard