vol: Only check "logging" on vice partitions

vol: Only check "logging" on vice partitions

We don't care about non-vicepX partitions, so move part of the UFS
"logging" check into VCheckPartition. This API should probably redone
so the "am I a vicepX partition" check is done completely separately,
but for now, this will do.

Change-Id: Ib2df2079a392d7ed1a8c2aded34f2a7265215ecd
Reviewed-on: http://gerrit.openafs.org/5514
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>