Add tox, pep8, pyflakes, testr support

Also fix the python to comply. This has to be done as a single
change otherwise we'll never bootstrap gating.

Change-Id: I4a21d57e0341802a1652428dee16c60abb30251d
Enable boto connection debugging
build args to push_status as a dict
Simple http client to replace boto and cfn-signal

Change-Id: I1fb60673788e59c4864e7bacc115b28e88d69515
Use http_client instead of curl for cfn-signal

Change-Id: Icc4f7633791afd2e8fad5c944fd33ba6e3ac762c