qa/tasks: drop python2 support from rgw related tests

Signed-off-by: Kefu Chai <kchai@redhat.com>

qa/tasks/tempest.py

@@ -1,11 +1,10 @@
 """
 Deploy and configure Tempest for Teuthology
 """
+import configparser
 import contextlib
 import logging
 
-from six.moves import configparser
-
 from teuthology import misc as teuthology
 from teuthology import contextutil
 from teuthology.exceptions import ConfigError

qa/tasks/tests/test_radosgw_admin.py

@@ -1,8 +1,4 @@
-import six
-if six.PY3:
-    from unittest.mock import Mock
-else:
-    from mock import Mock
+from unittest.mock import Mock
 
 from tasks import radosgw_admin
 

qa/tasks/util/rgw.py

@@ -2,7 +2,7 @@ import logging
 import json
 import time
 
-from six import StringIO
+from io import StringIO
 
 from teuthology import misc as teuthology
 

qa/tasks/vault.py

@@ -8,8 +8,8 @@ import logging
 import time
 import json
 from os import path
-from six.moves import http_client
-from six.moves.urllib.parse import urljoin
+from http import client as http_client
+from urllib.parse import urljoin
 
 from teuthology import misc as teuthology
 from teuthology import contextutil