Add workaround for Kubernetes 1.6 auth
Kuberentes 1.6 enforces authentication for kubelet Prometheus metrics endpoints. Force the configuration to use http instead.
Closes: https://gitlab.com/gitlab-org/gitlab-ce/issues/30886
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Kuberentes 1.6 enforces authentication for kubelet Prometheus metrics endpoints. Force the configuration to use http instead.
Closes: https://gitlab.com/gitlab-org/gitlab-ce/issues/30886