fedoauth login tweaks

This branch gets the login() method working against bodhi2 + pyramid_fas_openid and the pkgdb2 + flask-fas-openid.

It really doesn't feel like the Right Way:tm: to do things, but it's the only way I could successfully authenticate through both pyramid & flask fas openid modules. Changes may need to be made to these modules or in fedoauth as opposed to these hacks in python-fedora, I'm not quite sure.