Include hacking to test-requirements

Hacking provides valuable standard checks such as imports in
alphabetical order. Having this included in our pep8 check/job
the quality and readability of the code will be improved.

Change-Id: Ieedfcd340e9b700bdead0073bac39a505c8628b5

test-requirements.txt

@@ -5,3 +5,5 @@ jsonschema
 Sphinx
 sphinxcontrib.datatemplates
 refstack>=2.0.0
+hacking>=1.1.0,!=1.2.0 # Apache-2.0
+flake8!=3.0.0,!=2.6.2 # MIT

tools/checktests.py

@@ -12,8 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import ast
 import argparse
+import ast
 import importlib
 import json
 import os

tox.ini

@@ -24,9 +24,7 @@ commands=
 
 [testenv:pep8]
 ignore = W504
-deps =
-  flake8
-  {[testenv]deps}
+deps = {[testenv]deps}
 commands=
   bash tools/flake8wrap.sh
   doc8 -e .rst doc/source

working_materials/tabulate_scores.py

@@ -14,9 +14,9 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import re
-import json
 import argparse
+import json
+import re
 import textwrap