Integration test serves temp redirect endpoint

Added a way to serve a temporary server as OAuth2 redirect endpoint.

Can retrieve data for later stage of OAuth2 test.
New authdata table structure

To cope with a bug in upper.io, this is the work arround.
Improve AuthStorage logging
Update osin related code

[Pull request 21](https://github.com/RangelReale/osin/pull/21) of osin
is breaking backward compatibility. Need to change the code to work.