afs: Include FID in DoLockWarning

Provide the FID that is being locked when we warn about byte-range
locks, so the user can find what file the process is trying to lock.

Reviewed-on: http://gerrit.openafs.org/10795
Reviewed-by: D Brashear <shadow@your-file-system.com>
Tested-by: D Brashear <shadow@your-file-system.com>
(cherry picked from commit 4f253106dc5d1a5280b0a5be393df0e87e00a661)

Change-Id: I369e9505583c1b6b820b5bc54b8e4908ab8bf3e5
Reviewed-on: http://gerrit.openafs.org/10838
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>