fix transport issue with WATCH

Original issue https://github.com/kubernetes/client-go/issues/374#issuecomment-716846816
This could cause no update for 30 minutes...
Recent comments suggest that we can fix it and use http2 Transport for connecting to kube-apiserver and set ReadIdleTimeout: https://github.com/golang/net/blob/release-branch.go1.15/http2/transport.go#L117

we would need to switch all controllers that rely on WATCH to Go1.15 in order to fix this

import 	"golang.org/x/net/http2"
func configureKubeConfig(apiServerURL *url.URL, timeout time.Duration, stopCh <-chan struct{}) (*rest.Config, error) {
	tr := &http2.Transport{
                 ....
		ReadIdleTimeout:       10 * time.Second,   // <--
	}

...
}

Start from the configureKubeConfig entry point shown in the issue and inspect the controllers that rely on WATCH. Verify how the kube-apiserver transport is configured and whether the Go 1.15 HTTP/2 ReadIdleTimeout behavior addresses the reported 30-minute lack of updates. Done means affected watches continue receiving updates without the transport issue.