Vendor in latest k8s.io changes

These changes allow for the container's pid namespace to be set to the same
as the pod infra container's namespace if the pid namespace mode is set to POD

Signed-off-by: umohnani8 <umohnani@redhat.com>

vendor/k8s.io/kubernetes/pkg/proxy/util/endpoints.go

@@ -47,6 +47,7 @@ func IPPart(s string) string {
 	return ""
 }
 
+// PortPart returns just the port part of an endpoint string.
 func PortPart(s string) (int, error) {
 	// Must be IP:port
 	_, port, err := net.SplitHostPort(s)