Fix PEP 8 issues.

lib/ansible/modules/cloud/openstack/os_router.py

@@ -186,11 +186,13 @@ ROUTER_INTERFACE_OWNERS = set([
     'network:ha_router_replicated_interface'
 ])
 
+
 def _router_internal_interfaces(cloud, router):
     for port in cloud.list_router_interfaces(router, 'internal'):
         if port['device_owner'] in ROUTER_INTERFACE_OWNERS:
             yield port
 
+
 def _needs_update(cloud, module, router, network, internal_subnet_ids):
     """Decide if the given router needs an update.
     """