Fix floating ip tests by adding missing an import

Change-Id: I4fc8b4054dd8158bb35f8ee36c8e438552c498cb
diff --git a/tempest/tests/test_floating_ips_actions.py b/tempest/tests/test_floating_ips_actions.py
index 7029dfc..595dcba 100644
--- a/tempest/tests/test_floating_ips_actions.py
+++ b/tempest/tests/test_floating_ips_actions.py
@@ -1,9 +1,11 @@
 from nose.plugins.attrib import attr
+import unittest2 as unittest
+from unittest2.case import SkipTest
+
 from tempest import openstack
 from tempest import exceptions
 from tempest.common.utils.data_utils import rand_name
 from base_compute_test import BaseComputeTest
-from unittest2.case import SkipTest
 
 
 class FloatingIPsTest(BaseComputeTest):