fs getfid output changed for consistency with Windows implementation

fs getfid output changed for consistency with Windows implementation

This patch removes the redundant volume ID from the output of fs
getfid, and replaces it with the cell name, which is what the Windows
implementation provides.

Reviewed-on: http://gerrit.openafs.org/3007
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit d390df097cac0fb7815c43e071040559612b6360)
Change-Id: I930627e92672dd5012d5bca08d469f7fb7624be1
Reviewed-on: http://gerrit.openafs.org/3230