volinfo: accept vice partition id for -part option

Accept a partition id for the -part option. For example, -part a
is the same as -part /vicepa.

Reviewed-on: http://gerrit.openafs.org/4739
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 8fc3d6dfe196771a38f2bfe7275e90a73f742931)

Change-Id: I9a52dc881e6b77526656ca94e4f175241a79551b
Reviewed-on: http://gerrit.openafs.org/11257
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>