Replace six.iteritems() with .items()

1.As mentioned in [1], we should avoid usingg
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: I4c51b6f2f2d48681530f7369dfd8cfc1126f9d76

magnumclient/tests/osc/unit/osc_fakes.py

@@ -21,7 +21,6 @@ from keystoneauth1 import fixture
 import requests
 import six
 
-
 AUTH_TOKEN = "foobar"
 AUTH_URL = "http://0.0.0.0"
 USERNAME = "itchy"
@@ -191,7 +190,7 @@ class FakeResource(object):
         self._loaded = loaded
 
     def _add_details(self, info):
-        for (k, v) in six.iteritems(info):
+        for (k, v) in info.items():
             setattr(self, k, v)
 
     def _add_methods(self, methods):
@@ -202,7 +201,7 @@ class FakeResource(object):
         @value. When users access the attribute with (), @value will be
         returned, which looks like a function call.
         """
-        for (name, ret) in six.iteritems(methods):
+        for (name, ret) in methods.items():
             method = mock.Mock(return_value=ret)
             setattr(self, name, method)