Derive the OpenStack service list from the service file
Derive the OpenStack service list from the service file

This patch updates the sources-branch-updater to derive the OpenStack
service list from the service file provided on the CLI.

It will only pick up OpenStack git sources and will deliberately ignore
repositories which include a '-' in the name, as those are drivers or
plugins, not services. Drivers/plugins don't contain conf/policy files
which need updating with every SHA bump.

The requirements repo is also deliberately ignored as it contains no
services which require conf/policy file updates.

Change-Id: I51ad9e5e48da18cb46ccf9cfe12118c19c2a1f53

robb-romans/openstack-ansible,os-cloud/os-ansible-deployment,weezer/openstack-ansible,BjoernT/os-ansible-deployment,yanyao/openstack-ansible,cfarquhar/openstack-ansible,BjoernT/openstack-ansible,openstack/openstack-ansible,yanyao/openstack-ansible,stackforge/os-ansible-deployment,Logan2211/openstack-ansible,robb-romans/openstack-ansible,Logan2211/openstack-ansible,openstack/openstack-ansible,cloudnull/os-ansible-deployment,yanyao/newton,BjoernT/os-ansible-deployment,BjoernT/openstack-ansible,bunchc/openstack-ansible,os-cloud/os-ansible-deployment,weezer/openstack-ansible,stackforge/os-ansible-deployment,bunchc/openstack-ansible,cloudnull/os-ansible-deployment,yanyao/newton,cfarquhar/openstack-ansible,BjoernT/os-ansible-deployment