Ubuntu: Purge the default policy.yaml for Placement

The policy.yaml file provided by the UCA package contains wrong
modifications since Xena, which is causing consistent API error.

This change makes sure the file is purged in Ubuntu to workaround
the problem. This change will be reverted once the package file is
fixed.

Related-Bug: #1987984
Change-Id: I9e6e91c065f994433c9b92d9b84e7c1e6d61f3e5

manifests/placement.pp

@@ -42,6 +42,12 @@ class openstack_integration::placement {
     database_connection => 'mysql+pymysql://placement:placement@127.0.0.1/placement?charset=utf8',
   }
   include placement::db::sync
+  # TODO(tkajinam): Remove this once lp bug 1987984 is fixed.
+  if $::operatingsystem == 'Ubuntu' {
+    class { 'placement::policy':
+      purge_config => true
+    }
+  }
   include placement::api
   include apache
   if ($::operatingsystem != 'Debian') {