pkg/proxy: fix leaving around hung proxy goroutines
pkg/proxy: fix leaving around hung proxy goroutines

hongchaodeng/bootkube,dghubble/bootkube,ericchiang/bootkube,diegs/bootkube,diegs/bootkube,ericchiang/bootkube,hongchaodeng/bootkube,hongchaodeng/bootkube,ericchiang/bootkube,dghubble/bootkube,kubernetes-incubator/bootkube,dghubble/bootkube,diegs/bootkube,kubernetes-incubator/bootkube,kubernetes-incubator/bootkube