Replace designate-pool-manager by worker and producer services

pool-manager was deprecated some releases ago and has been removed in
train so let's move to the recommended deployment.

Change-Id: Iec7ad6e3a6d33a41afbbd5c88311f262320e2429
(cherry picked from commit 262203f86a)

manifests/designate.pp

@@ -65,19 +65,9 @@ class openstack_integration::designate {
 
   class { '::designate::central': }
 
-  class { '::designate::pool_manager':
-    pool_id => '794ccc2c-d751-44fe-b57f-8894c9f5c842',
-  }
+  class { '::designate::producer': }
 
-  # pool_manager and designate worker cannot be enabled together
-  class { '::designate::worker':
-    enabled        => false,
-    service_ensure => 'stopped',
-  }
-
-  class { '::designate::pool_manager_cache::memcache':
-    memcached_servers => $::openstack_integration::config::memcached_servers,
-  }
+  class { '::designate::worker': }
 
   class { '::designate::backend::bind9':
     rndc_host        => '127.0.0.1',