Fix router interface addition check.

* The cli has changed its output to include the interface id,
   which breaks router interface addition.
 * Did I mention we need to stop parsing cli output and switch
   to fog?

Change-Id: I6711d6e10d3dd5b6173a0cf8fc617a35bb75cd10

lib/puppet/provider/neutron_router_interface/neutron.rb

@@ -59,7 +59,7 @@ Puppet::Type.type(:neutron_router_interface).provide(
     results = auth_neutron("router-interface-add", '--format=shell',
                            resource[:name].split(':', 2))
 
-    if results =~ /Added interface to router/
+    if results =~ /Added interface.* to router/
       @property_hash = {
         :ensure => :present,
         :name   => resource[:name],