salvager: report actual uniqs for a too low error

when salvager fixes a "uniquifier too low" error, report
what it is fixing and what it was looking for.

Change-Id: I021bd7f69225ff02f4981aec1f6e64a4b1f3fc00
Reviewed-on: http://gerrit.openafs.org/9795
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>