Replace six.iteritems() with .items()

1.As mentioned in [1], we should avoid using
six.iteritems to achieve iterators.
We can use dict.items instead, as it will return
iterators in PY3 as well. And dict.items/keys will more readable.
2.In py2, the performance about list should be negligible, see the link [2].
[1] https://wiki.openstack.org/wiki/Python3
[2] http://lists.openstack.org/pipermail/openstack-dev/2015-June/066391.html

Change-Id: I9cf36db9e18d02238ebbfa6962f0ac76d694a43a

adjutantclient/common/base.py

@@ -24,7 +24,6 @@ import copy
 
 from oslo_utils import reflection
 from oslo_utils import strutils
-import six
 from six.moves.urllib import parse
 
 from adjutantclient._i18n import _
@@ -293,7 +292,7 @@ class CrudManager(BaseManager):
 
     def _filter_kwargs(self, kwargs):
         """Drop null values and handle ids."""
-        for key, ref in six.iteritems(kwargs.copy()):
+        for key, ref in (kwargs.copy().items()):
             if ref is None:
                 kwargs.pop(key)
             else:
@@ -451,7 +450,7 @@ class Resource(object):
         return None
 
     def _add_details(self, info):
-        for (k, v) in six.iteritems(info):
+        for (k, v) in (info).items():
             try:
                 setattr(self, k, v)
                 self._info[k] = v

adjutantclient/osc/v1/notifications.py

@@ -13,7 +13,6 @@
 #    under the License.
 
 import logging
-import six
 import json
 
 from osc_lib.i18n import _
@@ -28,7 +27,7 @@ def _show_notification(notification_id, client, formatter):
     if formatter == 'table':
         notification._info['notes'] = json.dumps(
             notification.notes, indent=2)
-    return zip(*six.iteritems(notification.to_dict()))
+    return zip(*(notification.to_dict()).items())
 
 
 class NotificationList(command.Lister):

adjutantclient/osc/v1/tasks.py

@@ -13,9 +13,7 @@
 #    under the License.
 
 import logging
-import six
 import json
-
 from osc_lib.command import command
 from osc_lib.i18n import _
 
@@ -34,7 +32,7 @@ def _show_task(task_id, client, formatter):
             getattr(task, 'action_notes', ""), indent=2)
         task._info['approved_by'] = json.dumps(
             getattr(task, 'approved_by', ""), indent=2)
-    return zip(*six.iteritems(task.to_dict()))
+    return zip(*(task.to_dict()).items())
 
 
 class TaskList(command.Lister):

adjutantclient/osc/v1/tokens.py

@@ -14,7 +14,6 @@
 
 import logging
 import json
-import six
 
 from osc_lib.command import command
 from osc_lib.i18n import _
@@ -75,7 +74,7 @@ class TokenShow(command.ShowOne):
         else:
             client = adjutant_client.Client("1", parsed_args.bypass_url)
         token = client.tokens.get(parsed_args.token)
-        return zip(*six.iteritems(token.to_dict()))
+        return zip(*(token.to_dict()).items())
 
 
 class TokenSubmit(command.Command):

adjutantclient/osc/v1/users.py

@@ -13,7 +13,6 @@
 #    under the License.
 
 import logging
-import six
 
 from osc_lib import utils
 from osc_lib.command import command
@@ -58,7 +57,7 @@ class UserShow(command.ShowOne):
         # be better to do something slightly different here
         user_id = utils.find_resource(client.users, parsed_args.user)
         user = client.users.get(user_id)
-        return zip(*six.iteritems(user.to_dict()))
+        return zip(*(user.to_dict()).items())
 
 
 class UserInvite(command.Command):

adjutantclient/v1/users.py

@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import six
+
 from six.moves.urllib import parse
 
 from adjutantclient.common import base
@@ -75,7 +75,7 @@ class UserManager(base.ManagerWithFind):
         #     filters = kwargs.pop('filters')
         #     params.update(filters)
 
-        for key, value in six.iteritems(kwargs):
+        for key, value in (kwargs).items():
             if value:
                 params[key] = value