Remove usage of six

Remove six-library Replace the following items with Python 3 style code.
- six.moves

Change-Id: Ied212eb0947c7441cc51193399185b4fb0f87271
diff --git a/tempest/lib/services/compute/snapshots_client.py b/tempest/lib/services/compute/snapshots_client.py
index 225eb8d..2e6f7cf 100644
--- a/tempest/lib/services/compute/snapshots_client.py
+++ b/tempest/lib/services/compute/snapshots_client.py
@@ -13,8 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from urllib import parse as urllib
+
 from oslo_serialization import jsonutils as json
-from six.moves.urllib import parse as urllib
 
 from tempest.lib.api_schema.response.compute.v2_1 import snapshots as schema
 from tempest.lib.common import rest_client