Use flake8-import-order

Use the flake8 plugin flake8-import-order to check import ordering. It can do
it automatically and don't need reviewers to check it.

Change-Id: Ief79a4696d7cd9b57e61a68e76bebb01027ed44c

test-requirements.txt

@@ -5,6 +5,7 @@
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage>=3.6
+flake8-import-order==0.11 # LGPLv3
 freezegun>=0.3.6  # Apache-2.0
 python-subunit>=0.0.18
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2

tox.ini

@@ -71,3 +71,4 @@ commands =
 show-source = True
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,node_modules
+import-order-style = pep8

valence/config.py

@@ -19,6 +19,7 @@
 
 
 import logging
+
 from six.moves import configparser
 
 

valence/tests/__init__.py

@@ -1,4 +1,5 @@
 from unittest import TestCase
+
 from valence.api.route import app
 
 

valence/tests/unit/api/test_app.py

@@ -11,10 +11,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
-
 import unittest
 
+import mock
+
 from valence.api import app
 
 

valence/tests/unit/controller/test_podmanagers.py

@@ -11,9 +11,10 @@
 #    under the License.
 
 import copy
-import mock
 import unittest
 
+import mock
+
 from valence.common import constants
 from valence.common.exception import BadRequest
 from valence.controller import podmanagers

valence/tests/unit/db/test_db_api.py

@@ -12,11 +12,11 @@
 #    under the License.
 
 import json
-import mock
 import unittest
 
 import etcd
 import freezegun
+import mock
 
 from valence.db import api as db_api
 from valence.tests.unit.db import utils

valence/tests/unit/db/test_etcd_db.py

@@ -11,10 +11,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
 import unittest
 
 import etcd
+import mock
 
 from valence.db import etcd_db