Check item is one of six.string_types not just str

Change-Id: I343d9f6bdb3509256191a44e686f24e0ebeb5d22
Closes-Bug: #1762612

designateclient/v2/cli/common.py

@@ -13,6 +13,7 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
+import six
 
 
 def add_all_projects_option(parser):
@@ -70,5 +71,5 @@ def set_all_common_headers(client, parsed_args):
         set_edit_managed(client, parsed_args.edit_managed)
 
     if parsed_args.sudo_project_id is not None and \
-            isinstance(parsed_args.sudo_project_id, str):
+            isinstance(parsed_args.sudo_project_id, six.string_types):
         set_sudo_project_id(client, parsed_args.sudo_project_id)

designateclient/v2/cli/zones.py

@@ -70,8 +70,6 @@ class ListZonesCommand(command.Lister):
         client = self.app.client_manager.dns
         common.set_all_common_headers(client, parsed_args)
 
-        common.set_all_common_headers(client, parsed_args)
-
         criterion = {}
         if parsed_args.type is not None:
             criterion["type"] = parsed_args.type