This patch updates the tripleo::firewall class so that it will
support loading firewall rules defined in composable services
via the following hiera keys (for nova-api for example):
tripleo.nova_api.firewall_rules
This patch relies on a new 'service_names' hiera array that should be
provided on all TripleO overcloud nodes.
Depends-On: I60861c5aa760534db3e314bba16a13b90ea72f0c
Change-Id: Id370362ab57347b75b1ab25afda877885b047263