Allow to disable OpenstackVersion CR setup

Currently if job name contains "periodic" in it
it always prepares OpenstackVersion CR, on some
cases it's required to use images pinned in
the bundle, for those cases adding a var(default true)
which can be disabled as needed. Same var is also
used in non-adoption jobs so also is consistent.

Signed-off-by: Yatin Karel <ykarel@redhat.com>

Author: karelyatin

tests/roles/backend_services/tasks/main.yaml

@@ -76,6 +76,7 @@
 
 - name: when periodic, create OpenStackVersion CR with container overrides
   when:
+    - cifmw_update_containers_openstack|default(true)
     - periodic|default(false)
     - container_registry is defined
     - container_tag is defined