Fix OIDC tests

[skion]

After merging #525 we noticed a drop in test coverage from 96% to 92%.

This PR attempts to correct that, re-enabling the undiscovered tests by adding two __init__.py files, and fixing a number of import problems.

[skion]

@wiliamsouza Can you check if this is OK?

[JonathanHuot]

Also, it raises an interesting question that we don't have the actual details of the tests runs by nosetests or Travis. I'm suggesting to add -v (verbose) to nosetests to trace records of each unittest runs into the Travis console.

I have also tested to produce an html report with nose-htmloutput and it's clear that each tests/openid tests are correctly run in this branch.

Do you see guys, an interest of adding the html report automatically when running tox ?

[thedrow]

LGTM.
Can we resolve the conflicts please?

[skion]

@thedrow Rebased

[JonathanHuot]

Wonderful achievement here, congrats to @wiliamsouza and @skion to make this a reality !