Return network options when AllocateNetwork called

The returned options are passed to CreateNetwork.

Change-Id: I8e03d2b4fe8e4309ca22ba5f3f497d1c332e1c91
Closes-Bug: 1706481

kuryr_libnetwork/controllers.py

@@ -649,10 +649,9 @@ def network_driver_allocate_network():
     json_data = flask.request.get_json(force=True)
     LOG.debug("Received JSON data %s for "
               "/NetworkDriver.AllocateNetwork", json_data)
-    # Note(limao): This API will only called in docker swarm mode,
-    #              we do not have specific resource need to allocate
-    #              right now, so just return SUCCESS.
-    return flask.jsonify(const.SCHEMA['SUCCESS'])
+    # Note(limao): This API will only called in docker swarm mode
+    # The returned options are passed to CreateNetwork.
+    return flask.jsonify({'Options': json_data.get('Options')})
 
 
 @app.route('/NetworkDriver.FreeNetwork', methods=['POST'])

kuryr_libnetwork/tests/unit/test_kuryr.py

@@ -2282,7 +2282,7 @@ class TestKuryr(base.TestKuryrBase):
                                      allocate_network_request))
         self.assertEqual(200, response.status_code)
         decoded_json = jsonutils.loads(response.data)
-        self.assertEqual(constants.SCHEMA['SUCCESS'], decoded_json)
+        self.assertEqual({'Options': {}}, decoded_json)
 
     def test_network_driver_free_network(self):
         docker_network_id = lib_utils.get_hash()