vos release: Avoid full dump on all sites

vos release: Avoid full dump on all sites

Commit 9fed169b1c5c823fd96cea94daf712b2cf06c901 attempts to remove any
remote RO site that has RO_DONTUSE set. However, we set RO_DONTUSE on
all sites earlier in the release process if this is a full release,
resulting in all sites getting a full dump.

Correct this by remembering in 'origflags' what flags each site has
before we messed with the vldb entry.

Thanks to Mike Meffie.

Reviewed-on: http://gerrit.openafs.org/3296
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Tested-by: Michael Meffie <mmeffie@sinenomine.net>
(cherry picked from commit 97474963e58253f8c891e9f6596403213d53527b)

Change-Id: I5a14c490dba7e1ad815856ccb3f90e210e09f50d
Reviewed-on: http://gerrit.openafs.org/3624
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>