Fix cinder cert permissions (#7384)

* Fix permissions of cinder cert

* Change runuser for external_cloud_controller to kube user with id 999, part of 999 - kube-cert group

roles/kubernetes-apps/external_cloud_controller/openstack/templates/external-openstack-cloud-controller-manager-ds.yml.j2

@@ -30,7 +30,7 @@ spec:
         node-role.kubernetes.io/control-plane: ""
 {% endif %}
       securityContext:
-        runAsUser: 1001
+        runAsUser: 999
       tolerations:
       - key: node.cloudprovider.kubernetes.io/uninitialized
         value: "true"