Log only to stderr (the default behavior of klog). If logging to a file, on GKE Master the controller cannot run as non-root.
Log only to stderr (the default behavior of klog). If logging to a file, on GKE Master the controller cannot run as non-root.

Change-Id: If8b8af88911b54a6e27607e692fc764c63a8912a

GoogleCloudPlatform/gke-managed-certs,GoogleCloudPlatform/gke-managed-certs