scout: display fetch and store counts as unsigned

scout: display fetch and store counts as unsigned

Fetches and stores are already defined as unsigned, so format
them as unsigned values when displaying in scout. This fixes
the bug where scout shows those counts as negative values on
busy servers which have been running for a while.

Reviewed-on: http://gerrit.openafs.org/2843
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit e28bb036b85ea90c0ecf8d52a17043374c1fef3a)
Change-Id: If4d0a72b94e743dd336f31b4c21da7e68f800f11
Reviewed-on: http://gerrit.openafs.org/2923
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>