Adjust configure defaults for 1.8

Disable pam; enable pthreaded ubik.
(Pam is actually not installed by default anyway, since it is
functionally part of kauth.)

pthreaded ubik is believed to be stable, and we want to move away
from LWP moving forward.

Change-Id: I14d20e3157df625a9e04059534bbb59268384213
Reviewed-on: http://gerrit.openafs.org/11483
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Tested-by: D Brashear <shadow@your-file-system.com>
Let mancheck_utils ignore version subcommands

We don't have a man page for the 'version' subcommand, which has
"always" been present but only recently was exposed to the usage.
It's okay to not have a man page for it, so tell the test infrastructure
to not complain about its absence.

Change-Id: Ife834d41797d1d1efe403b204736ac85d62724e9
Reviewed-on: http://gerrit.openafs.org/11452
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Tested-by: D Brashear <shadow@your-file-system.com>