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.

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>
(cherry picked from commit affc978be7ba3c36c9b7a6a94fb5e907beebed99)

Change-Id: If871ce0cdd3593250f22d74de184f92b046b5f6e
Reviewed-on: http://gerrit.openafs.org/6270
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>