Authentication uses boolean for enable_authentication now

* Changed Oslo Config from StrOpt() to BoolOpt() (as it was used that way)
* auth_token was overloaded, changed it to recv_auth_token to fix this
* Found/fixed some minor pep8 issues

Change-Id: Id8b702bcf84c8ad1a3cc1594fe4f0743fd715580
Merge "Authentication uses boolean for enable_authentication now"