vldb_check: cope with broken names and volids

Fix-up broken vlentry names and rw volid so entries can be looked
up in the vlserver and can be deleted with vos delentry if needed.

Reviewed-on: http://gerrit.openafs.org/9905
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit 7a89c4f94440ac1c8ebf16107ece3b56c178ffc9)

Change-Id: I2cf2d711f6dee08b2d27429ff4d37290bc21b9a2
Reviewed-on: http://gerrit.openafs.org/10268
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>