This change introduces automated configuration of firewalld and adds
a new filter for extracting services from the project_services dict.
the filter selects any enabled services and their haproxy element
and returns them so they can be iterated over.
This commit also enables automated configuration of firewalld from enabled
openstack services and adds them to the defined zone and reloads the
system firewall.

Change-Id: Iea3680142711873984efff2b701347b6a56dd355