FSSYNC-Client: Consistent use of partition name

FSSYNC-Client:  Consistent use of partition name

Over time the FSSYNC code has collected examples where the partition
path is passed rather than the partition name.  In Unix this is the
same (/vicepX), but on windows the path is the DOS device (C:).

This checkin changes FSSYNC client code to always use the partition
name.

This checkin does not address FSSYNC server or SALVSYNC.

Reviewed-on: http://gerrit.openafs.org/5521
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit b4f96eb78d9403799b97a39b9659070cf1114cd1)

Change-Id: I84d3dd586c735e9a6e2f598317873ba554a10ece
Reviewed-on: http://gerrit.openafs.org/5547
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>