Automatically get pools capabilities for flavor

For Zaqar API v2, admin user can't set the capabilities for flavor
manually. So the field was always empty. This patch fixes the issue.

Closes-Bug: #1679891

Change-Id: I2c9068c849cbfc7b5d2651627a5db7f9025d1473

zaqar/tests/unit/transport/wsgi/v2_0/test_flavors.py

@@ -132,12 +132,11 @@ class TestFlavorsMongoDB(base.V2Base):
                           body=jsonutils.dumps({'pool_group': pool_group}))
         self.assertEqual(falcon.HTTP_400, self.srmock.status)
 
-    @ddt.data(-1, 'wee', [])
-    def test_put_raises_if_invalid_capabilities(self, capabilities):
+    def test_put_auto_get_capabilities(self):
         path = self.url_prefix + '/flavors/' + str(uuid.uuid1())
-        doc = {'pool_group': 'a', 'capabilities': capabilities}
+        doc = {'pool_group': self.pool_group}
         self.simulate_put(path, body=jsonutils.dumps(doc))
-        self.assertEqual(falcon.HTTP_400, self.srmock.status)
+        self.assertEqual(falcon.HTTP_201, self.srmock.status)
 
     def test_put_existing_overwrites(self):
         # NOTE(cabrera): setUp creates default flavor

zaqar/transport/wsgi/v2_0/flavors.py

@@ -182,10 +182,12 @@ class Resource(object):
         data = wsgi_utils.load(request)
         wsgi_utils.validate(self._validators['create'], data)
         pool_group = data.get('pool_group') or data.get('pool')
+        capabilities = self._pools_ctrl.capabilities(pool_group)
         try:
             self._ctrl.create(flavor,
                               pool_group=pool_group,
-                              project=project_id)
+                              project=project_id,
+                              capabilities=capabilities)
             response.status = falcon.HTTP_201
             response.location = request.path
         except errors.PoolGroupDoesNotExist as ex: