Restart after plugins or policies have changed
Restart after plugins or policies have changed

To avoid every run of the role causing a restart of rabbitmq services,
move the restart task until after the tasks for configuring plugins and
policies so that 'rabbitmq_plugin' and 'rabbitmq_policy' are registered.

Change-Id: If7aeeab81a2b8dc722d460b1dba8e65f63285b10

openstack/openstack-ansible-rabbitmq_server,openstack/openstack-ansible-rabbitmq_server