Don't log sensitive auth data

Add the ability to turn off logging from the session object and then
handle logging of auth requests within their own sections.  This is a
very simplistic ability to completely disable logging.  Logging more
filtered debugging can be added later.

This new ability is utilized in this patch to prevent logging of
requests that include passwords.  This covers authenticate, password
change, and user update requests that include passwords.

SecurityImpact
Change-Id: I3dabb94ab047e86b8730e73416c1a1c333688489
Closes-Bug: #1004114
Closes-Bug: #1327019
Merge "Don't log sensitive auth data"