DEVEL15-vos-volser-enhancements-20080121

DEVEL15-vos-volser-enhancements-20080121

LICENSE IPL10

add option to addsite to allow adding a site where there is already a release-
equivalent volume resident, where thus we don't want to mark unreleased

(possible by dumping an existing RO and restoring with -readonly at the
 new site)

add ability to vos clone to a readonly or backup with the correct ID and name

add ability when restoring a RW to a new site to leave the volume at the old
site intact

all changes are internal to vos and can be used with any OpenAFS from 2006
or later (supporting changes in namei to not create volumes with bad parent
id went in in December 2005)

(cherry picked from commit e1c4e77d13122c2bb66d532ffd9dfc2e75318c04)