Drop izip and izip_longest removed in python3

itertools.izip_longest and itertools.izip do not exist in Python 3.

Change-Id: I78359bbc48f4ac7ce075ae577481697380d73a33
Partial-Implements: blueprint porting-python3

horizon/tables/formset.py

@@ -11,7 +11,6 @@
 #    under the License.
 
 import collections
-import itertools
 import logging
 import sys
 
@@ -137,8 +136,8 @@ class FormsetDataTableMixin(object):
             else:
                 formset = self.get_formset()
                 formset.is_valid()
-            for datum, form in itertools.izip_longest(self.filtered_data,
-                                                      formset):
+            for datum, form in six.moves.zip_longest(self.filtered_data,
+                                                     formset):
                 row = self._meta.row_class(self, datum, form)
                 if self.get_object_id(datum) == self.current_item_id:
                     self.selected = True

openstack_dashboard/test/api_tests/network_tests.py

@@ -14,12 +14,12 @@
 
 import collections
 import copy
-import itertools
 import uuid
 
 from django import http
 from django.test.utils import override_settings
 from mox3.mox import IsA  # noqa
+import six
 
 from novaclient.v2 import floating_ip_pools
 
@@ -369,7 +369,7 @@ class NetworkApiNeutronSecurityGroupTests(NetworkApiNeutronTestBase):
         self.assertEqual(exp_sg['name'], ret_sg.name)
         exp_rules = exp_sg['security_group_rules']
         self.assertEqual(len(exp_rules), len(ret_sg.rules))
-        for (exprule, retrule) in itertools.izip(exp_rules, ret_sg.rules):
+        for (exprule, retrule) in six.moves.zip(exp_rules, ret_sg.rules):
             self._cmp_sg_rule(exprule, retrule)
 
     def test_security_group_list(self):
@@ -382,7 +382,7 @@ class NetworkApiNeutronSecurityGroupTests(NetworkApiNeutronTestBase):
 
         rets = api.network.security_group_list(self.request)
         self.assertEqual(len(sgs), len(rets))
-        for (exp, ret) in itertools.izip(sgs, rets):
+        for (exp, ret) in six.moves.zip(sgs, rets):
             self._cmp_sg(exp, ret)
 
     def test_security_group_get(self):