Don't log sensitive auth data

This code change redacts the password in keystone request, and
also redact the token text in keystone response. The code still
makes REST call by itelf, instead of calling keystone client.

Closes-Bug: 1327019

Change-Id: Ib9c0610c1ef351a127364478721cf961c2a30125
Merge "Don't log sensitive auth data"