Remove six from functional tests

This is part of the steps to remove usage of six library, which is no
longer needed since python 2 support was removed.

Change-Id: Ic0b3687c47b6f3ac51858084bcf11a5c5a185759

magnum/tests/functional/common/client.py

@@ -11,16 +11,14 @@
 # under the License.
 
 import abc
+from urllib import parse
 
-import six
-from six.moves.urllib import parse
 from tempest.lib.common import rest_client
 
 from magnum.tests.functional.common import config
 
 
-@six.add_metaclass(abc.ABCMeta)
-class MagnumClient(rest_client.RestClient):
+class MagnumClient(rest_client.RestClient, metaclass=abc.ABCMeta):
     """Abstract class responsible for setting up auth provider"""
 
     def __init__(self, auth_provider):

magnum/tests/functional/python_client_base.py

@@ -17,14 +17,13 @@ test_magnum
 Tests for `magnum` module.
 """
 
+import configparser
 import os
 import subprocess
 import tempfile
 import time
 
 import fixtures
-from six.moves import configparser
-
 from heatclient import client as heatclient
 from keystoneauth1.identity import v3 as ksa_v3
 from keystoneauth1 import session as ksa_session