libafs: Always use anonymous VL connections

libafs: Always use anonymous VL connections

afs_NewVolumeByName was using the areq given by the caller for
afs_SetupVolume, which may represent authenticated credentials. Give
afs_SetupVolume &treq instead, which will be anonymous, so we don't
have to deal with rxkad for VL lookups.

Reviewed-on: http://gerrit.openafs.org/4666
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 4a82c0cc4167b729108813965bd39bf86ea15e6b)

Change-Id: Ic10e85b925176719c6c5dc708a1d1a315409d295
Reviewed-on: http://gerrit.openafs.org/6300
Tested-by: Derrick Brashear <shadow@dementix.org>
Reviewed-by: Derrick Brashear <shadow@dementix.org>