[ci] Add openstack namespace to deploy_loki_for_cloudkitty

The loki hook requires the openstack namespace to exist in order to create the s3 storage secret.
If the hook is run before the openstakc namespace is create, it will fail.

This addresses that issue by creating a minimal openstack namespace.

Author: elfiesmelfie

ci/deploy-loki-for-ck.yaml

@@ -1,6 +1,11 @@
 ---
 apiVersion: v1
 kind: Namespace
+metadata:
+  name: openstack
+---
+apiVersion: v1
+kind: Namespace
 metadata:
   name: openshift-operators-redhat
   labels: