Add flake8-import-order extension to tox.ini

This package adds 3 new flake8 warnings

* ``I100``: Your import statements are in the wrong order.
* ``I101``: The names in your from import are in the wrong order.
* ``I201``: Missing newline between sections or imports.

Change-Id: I4feabcd4db583d213e0e4d414eee267b0ddb8870
diff --git a/manila_tempest_tests/tests/scenario/manager.py b/manila_tempest_tests/tests/scenario/manager.py
index c83dfe6..1fa03f4 100644
--- a/manila_tempest_tests/tests/scenario/manager.py
+++ b/manila_tempest_tests/tests/scenario/manager.py
@@ -21,7 +21,6 @@
 from oslo_utils import netutils
 from oslo_utils import uuidutils
 import six
-
 from tempest.common import compute
 from tempest.common import image as common_image
 from tempest.common.utils.linux import remote_client
@@ -32,14 +31,14 @@
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions as lib_exc
-import tempest.test
+from tempest import test
 
 CONF = config.CONF
 
 LOG = log.getLogger(__name__)
 
 
-class ScenarioTest(tempest.test.BaseTestCase):
+class ScenarioTest(test.BaseTestCase):
     """Base class for scenario tests. Uses tempest own clients. """
 
     credentials = ['primary']