Make keystoneclient not log auth tokens

I think I've looked at every log statement in this repo and I've either
removed the tokens from the log strings or made them print out
"<SANITIZED>" instead.

Change-Id: I1efbc834fcab951f6797b56afb5c5519cc70d28c
Closes-Bug: 1287938
Merge "Make keystoneclient not log auth tokens"