BZ #1045132 - l3 external_network_bridge now configurable.

https://bugzilla.redhat.com/show_bug.cgi?id=1045132

$external_network_bridge is used to configure the external_network_bridge
in /etc/neutron/l3_agent.ini .  Set to '' to use a provider
network instead.

puppet/modules/quickstack/manifests/neutron/networker.pp

@@ -11,7 +11,7 @@
  $public_interface = $quickstack::params::public_interface,
  $mysql_host = $quickstack::params::mysql_host,
  $qpid_host = $quickstack::params::qpid_host,
- $bridge_name  = 'br-ex',
+ $external_network_bridge = 'br-ex',
  $bridge_keep_ip = true,
  $tenant_network_type = $quickstack::params::tenant_network_type,
  $ovs_bridge_mappings = $quickstack::params::ovs_bridge_mappings,
@@ -61,7 +61,9 @@
 
  class { '::neutron::agents::dhcp': }
 
- class { '::neutron::agents::l3': }
+ class { '::neutron::agents::l3':
+ external_network_bridge => $external_network_bridge,
+ }
 
  class { 'neutron::agents::metadata':
  auth_password => $admin_password,