Let mancheck_utils ignore version subcommands

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>