Add zuul job to run tox-format environment for executing black and isort

This will allow us to have more consistent and clean code.

Change-Id: I8a49053d016c52b7b44136a6a8f36f9ad12675c3

.zuul.yaml

@@ -1,7 +1,9 @@
 - project:
     check:
       jobs:
+        - tox-format
         - tox-pep8
     gate:
       jobs:
+        - tox-format
         - tox-pep8

pyproject.toml

@@ -0,0 +1,2 @@
+[tool.black]
+line-length = 120

setup.cfg

@@ -53,3 +53,25 @@ universal = 1
 [pbr]
 skip_authors = True
 skip_changelog = True
+
+[flake8]
+# E123, E125 skipped as they are invalid PEP-8.
+# E741, short ambiguous variable names
+# H106 Don’t put vim configuration in source files
+# H203 Use assertIs(Not)None to check for None
+max-line-length = 120
+ignore = E123,E125,E741
+enable-extensions=H106,H203
+show-source = True
+exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
+
+[isort]
+known_first_party = ara
+default_section = THIRDPARTY
+skip = build,.git,.tox,.cache,.venv
+not_skip = __init__.py
+multi_line_output=3
+include_trailing_comma=True
+force_grid_wrap=0
+combine_as_imports=True
+line_length=88

test-requirements.txt

@@ -3,3 +3,5 @@ coverage
 flake8
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 sphinx-rtd-theme
+black==18.9b0 ; python_version >= '3.6' # Exact version for prerelease
+isort

tox.ini

@@ -22,13 +22,7 @@ commands =
   flake8 ara
   bandit -r ara
 
-[flake8]
-# E123, E125 skipped as they are invalid PEP-8.
-# E741, short ambiguous variable names
-# H106 Don’t put vim configuration in source files
-# H203 Use assertIs(Not)None to check for None
-max-line-length = 120
-ignore = E123,E125,E741
-enable-extensions=H106,H203
-show-source = True
-exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
+[testenv:format]
+commands =
+    black --diff --check ara
+    isort --recursive --check-only --diff --virtual-env {envdir} ara