Add rbac for ironic-operator creating namespaces

The graphical consoles feature will create the namespace
openstack-ironic-consoles which Ironic will use to create the graphical
console pods.

To do this, ironic-operator needs rbac rules to create and manage (not
delete) namespaces. This is proposed as a standalone change because it
needs to be packaged in the openstack-operator bundle before
ironic-operator can use it.

Jira: OSPRH-20211

Author: steveb

config/rbac/role.yaml

@@ -205,3 +205,14 @@ rules:
   - list
   - update
   - watch
+- apiGroups:
+  - ""
+  resources:
+  - namespaces
+  verbs:
+  - create
+  - get
+  - list
+  - patch
+  - update
+  - watch