Adds Flake8 job to the lint check

This update uses the lint check script to add a hacking/flake8
job which will ensure that all python files are passing what is
required by OpenStack.

Change-Id: If8312de8ca6822b7aa562775727c91a34987f845
Partial-Bug: 1440462

scripts/gate-check-lint.sh

@@ -32,6 +32,13 @@ else
   pip2 install ansible-lint || pip install ansible-lint
 fi
 
+# Run hacking/flake8 check for all python files
+# Ignores the following rules due to how ansible modules work in general
+#     F403 'from ansible.module_utils.basic import *' used; unable to detect undefined names
+#     H303  No wildcard (*) import.
+flake8 --ignore=F403,H303 $(grep -rln -e '^#!/usr/bin/env python' -e '^#!/bin/python' * )
+
+
 # Create keys if they don't already exist.
 ssh_key_create