DAFS: listvol + unsalvagable volumes = intolerable delay

DAFS: listvol + unsalvagable volumes = intolerable delay

a non- inService volume (or more) plus vos listvol equals pain.
return Salvaging instead of waiting for it in the listvol case.

Change-Id: I02bdbb6448bcf56e97db9324aa723cc753a37632
Reviewed-on: http://gerrit.openafs.org/3588
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>