MFC: r262273

Further refine the auth fail regex to catch more auth failures and
reduce false positives.

The committed patch was provided by Christian Marg.

PR:		91732
Submitted by:	Daniel O'Connor <doconnor at gsoft.com.au>
    		Skye Poier <spoier at gmail.com>
    		Alan Amesbury <amesbury at umn.edu>
    		Christian Marg <marg at rz.tu-clausthal.de>