add JSON debugging output

[ktdreyer]

For debugging, it would be nice to have some way to say "print all the JSON that the Errata Tool gives me".

This would be similar to koji's --debug-xmlrpc flag, or python-bugzilla's --debug flag.

We will need to add python logging, and print the JSON at the debug level.

[yazug]

the pull request #159 addresses getting v1 api data, but as noted in review addition of unittests and doctext would be nice to get added

[yazug]

I would say that this approach while nice should not be used for long term automation, and instead any features not exposed should be mapped through for parsing and consumption. This is so that tooling that works on errata-tool library has one layer of abstraction from implementation details. Over time ET has shifted and deprecated APIs and not all of the necessary fields that we currently parse work with are provided by the v1 api single call api.