Always display vnode accesses in vos output

Always display vnode accesses in vos output

Vos was not displaying the "N accesses in the past day (i.e., vnode
references)" message when updateDate was unset. Fix that.

FIXES 125064

Reviewed-on: http://gerrit.openafs.org/9
Verified-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit f52b97b76cba008c9aa6ae843869c95d83fbd9f9)
Reviewed-on: http://gerrit.openafs.org/272
Tested-by: Derrick Brashear <shadow@dementia.org>