Save volume_type/group_type uuid into db when creating group

When creating groups, if volume type name or group type name is
passed, cinder-api will try to save the name rather uuid into
the database. It will make a foreign key constraint fails. After
this change, we always save uuid into database.

Change-Id: Ib333130325fc12a4753c7a128e823e992e8c8682
Closes-Bug: #1622476

cinder/group/api.py

@@ -151,8 +151,8 @@ class API(base.Base):
                   'status': c_fields.GroupStatus.CREATING,
                   'name': name,
                   'description': description,
-                  'volume_type_ids': volume_types,
-                  'group_type_id': group_type}
+                  'volume_type_ids': [t['id'] for t in req_volume_types],
+                  'group_type_id': req_group_type['id']}
         group = None
         try:
             group = objects.Group(context=context, **kwargs)