vos: remaddrs sub-command

vos: remaddrs sub-command

Introduce the vos remaddrs sub-command for removing multi-homed server
entries from the vldb.  The remaddrs sub-command completes the listaddrs
and setaddrs command suite and allows vos changeaddr to be deprecated
completely.

Reviewed-on: http://gerrit.openafs.org/11606
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams <3chas3@gmail.com>
Reviewed-by: Daria Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit d1d411576cf39c4bc55918df0eb64327718d566c)

Change-Id: I427077559509c9cb658a6758d8b371b744e6c643
Reviewed-on: http://gerrit.openafs.org/12092
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>