Remove usage of six

Remove six-library Replace the following items with Python 3 style code.
- six.interger_types
- six.text_type
- six.string_types
- six.PY3
- six.moves
- six.add_metaclass
- six.ensure_str
- six.reraise

Change-Id: I0c7691b3d6f6315137d8f0b9eeaa3b8e76749c04

cyborg/tests/unit/api/controllers/v2/test_device_profiles.py

@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from six.moves import http_client
+from http import client as http_client
 from unittest import mock
 import webtest