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: I43d1d93817fa533fdfc68893008a2921eb09ddcf

distilclient/common/apiclient/base.py

@@ -303,7 +303,7 @@ 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:
@@ -461,7 +461,7 @@ 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

distilclient/common/apiclient/exceptions.py

@@ -421,7 +421,7 @@ class HttpVersionNotSupported(HttpServerError):
 # _code_map contains all the classes that have http_status attribute.
 _code_map = dict(
     (getattr(obj, 'http_status', None), obj)
-    for name, obj in six.iteritems(vars(sys.modules[__name__]))
+    for name, obj in vars(sys.modules[__name__]).items()
     if inspect.isclass(obj) and getattr(obj, 'http_status', False)
 )
 

distilclient/common/cliutils.py

@@ -195,7 +195,7 @@ def print_dict(dct, dict_property="Property", wrap=0):
     """
     pt = prettytable.PrettyTable([dict_property, 'Value'])
     pt.align = 'l'
-    for k, v in six.iteritems(dct):
+    for k, v in dct.items():
         # convert dict to str to check length
         if isinstance(v, dict):
             v = six.text_type(v)

distilclient/v2/client.py

@@ -16,7 +16,6 @@ from keystoneclient import adapter
 from keystoneclient import client as ks_client
 from keystoneclient import discover
 from keystoneclient import session
-import six
 
 from distilclient.common import httpclient
 from distilclient import exceptions
@@ -109,7 +108,7 @@ class Client(object):
                 'api_key': 'password',
             }
 
-            for arg, replacement in six.iteritems(deprecated):
+            for arg, replacement in deprecated.items():
                 if kwargs.get(arg, None) is None:
                     continue