Configure service_provider for VPNaaS

A service_provider needs to be configured in
/etc/neutron/neutron_vpnaas.conf for neutron-server to start
correctly when VPNaaS is configured.

Please note this is currently done in a hacky way, and it should be
changed as soon as proper support is added in puppet-neutron (see
https://bugs.launchpad.net/puppet-neutron/+bug/1538971 for details).

Change-Id: I40cd7d8dfe64bf14fad5960061d2f40869bce642

packstack/puppet/templates/neutron_vpnaas.pp

@@ -1,3 +1,15 @@
 class { '::neutron::agents::vpnaas':
-  enabled => true,
+  enabled           => true,
+  vpn_device_driver => 'neutron_vpnaas.services.vpn.device_drivers.ipsec.OpenSwanDriver',
+}
+
+# FIXME: this is a workaround until
+# https://bugs.launchpad.net/puppet-neutron/+bug/1538971 is fixed
+
+file_line { 'vpnaas_service_provider':
+  path    => '/etc/neutron/neutron_vpnaas.conf',
+  match   => '^service_provider +=.*',
+  line    => 'service_provider = VPN:openswan:neutron_vpnaas.services.vpn.service_drivers.ipsec.IPsecVPNDriver:default',
+  require => Class['::neutron::agents::vpnaas'],
+  notify  => Service['neutron-server'],
 }