Add use_hostnames to ansible clouds.yaml

This is the clouds.yaml file that gets used by the ansible openstack
inventory system.  Setting use_hostnames to true indicates that
generally, our hostnames are expected to be unique, so ansible can
add them to the inventory based on their hostnames rather than their
uuids.  In the case that we have more than one host with the same
hostname, ansible will still favor uuids.

This should cause our logs to be more readable as they will include
hostnames for most of the ansible actions.

Change-Id: Ie4c24317429a8f0ac59729a2065dfae7fc6679d9

modules/openstack_project/templates/puppetmaster/ansible-clouds.yaml.erb

@@ -1,3 +1,5 @@
+ansible:
+  use_hostnames: True
 cache:
   expiration_time: 86400
   path: /var/cache/ansible-inventory