The "hacking" package used in most OpenStack repos pulls in
additional pep8 rules.  This commit should fix all of them
other than a hand full in the build.py file which will
be fixed in a separate commit

Change-Id: I40a0a30d338592ad64123e3da5523b9ad95a7a9c
Partially-Implements: blueprint enable-flake8

Change-Id: Ie6e77a4d45210122746b544a1aa8da563833e395
Partially-Implements: blueprint enable-flake8

This patch adds a script for validating YAML files, and replaces the
existing JSON checks with one largely identical to the YAML check.

This also provides a script that can be installed as a pre-commit hook
that will perform this checks when you commit changes.  You can install
the hook by running tools/pre-commit-hook --install.

Change-Id: Ib4742a9db062362cfa61d669c691151bc1ca376c