Allow baymodel name when bay is created

Bay needs baymodel id when bay is created. But usually, user want to use
`baymodel name` instead of baymodel id.
This patch supports baymodel name when bay is created.

Eg. magnum bay-create --name bay1 --baymodel-id baymodel-name

Partially implements blueprint name-based-resource-management

Change-Id: I8c042c461d46a251c1cd6772979d77a95b902de5

magnum/api/controllers/v1/bay.py

@@ -52,7 +52,7 @@ class Bay(base.APIBase):
     def _set_baymodel_id(self, value):
         if value and self._baymodel_id != value:
             try:
-                baymodel = objects.BayModel.get(pecan.request.context, value)
+                baymodel = api_utils.get_rpc_resource('BayModel', value)
                 self._baymodel_id = baymodel.uuid
             except exception.BayModelNotFound as e:
                 # Change error code because 404 (NotFound) is inappropriate

magnum/tests/api/controllers/v1/test_bay.py

@@ -319,7 +319,7 @@ class TestPost(api_base.FunctionalTest):
 
     def setUp(self):
         super(TestPost, self).setUp()
-        obj_utils.create_test_baymodel(self.context)
+        self.baymodel = obj_utils.create_test_baymodel(self.context)
         p = mock.patch.object(rpcapi.API, 'bay_create')
         self.mock_bay_create = p.start()
         self.mock_bay_create.side_effect = self._simulate_rpc_bay_create
@@ -383,6 +383,12 @@ class TestPost(api_base.FunctionalTest):
         self.assertEqual(400, response.status_int)
         self.assertTrue(response.json['error_message'])
 
+    def test_create_bay_with_baymodel_name(self):
+        bdict = apiutils.bay_post_data(baymodel_id=self.baymodel.name)
+        response = self.post_json('/bays', bdict, expect_errors=True)
+        self.assertEqual('application/json', response.content_type)
+        self.assertEqual(201, response.status_int)
+
     def test_create_bay_with_node_count_zero(self):
         bdict = apiutils.bay_post_data()
         bdict['node_count'] = 0