Designate: Ensure pool management by puppet is disabled

The puppet-designate module now supports setting up pools. The feature
is disabled at time of writing but we plan to enable it in an upcoming
release.
Because in TripleO we have separate tasks for pool management, this
ensures the feature is disabled.

Depends-on: https://review.opendev.org/830017
Change-Id: Ie1d6530ec304e89da7a888cbf74511242d3b4717

deployment/designate/designate-central-container-puppet.yaml

@@ -148,6 +148,7 @@ outputs:
               if:
                 - designate_min_ttl_set
                 - {get_param: DesignateMinTTL}
+            designate::backend::bind9::manage_pool: false
           - if:
             - designate_resource_email_set
             - designate::central::managed_resource_email: {get_param: DesignateManagedResourceEmail}