Remove six

We don't need this in a Python 3-only world.

Change-Id: I0ec4a2fe359c285460f64949943649b25938f3b1

magnum_tempest_plugin/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_tempest_plugin.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):

requirements.txt

@@ -5,5 +5,4 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0
-six>=1.10.0 # MIT
 oslo.log>=3.36.0 # Apache-2.0