upgrade: block upgrade when rgw multisite is deployed

See BZ for details.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2063702

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/rolling_update.yml

@@ -31,6 +31,11 @@
       import_role:
         name: ceph-defaults
 
+    - name: block upgrade for RHCS deployments with RGW multisite
+      fail:
+        msg: "Red Hat Ceph Storage upgrade with RGW multisite deployed isn't allowed with this release."
+      when: rgw_multisite | bool
+
     - name: exit playbook, if user did not mean to upgrade cluster
       fail:
         msg: >