budb: fix signedness of hash address logging

lots of places we print an unsigned int as a signed int.
the resulting output is confusing. so. stop that.

Change-Id: I5659139b92de225ffb9593e5bf7f5ae997d5d212
Reviewed-on: http://gerrit.openafs.org/9702
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>