Prior to patch eeda5882, Ganeti checked all the LVs on nodes under
its control, and dutifuly declared any stray volumes as orphans in
warnings emitted during cluster-verify. After the patch, the nodes
returned information related only to the LV set as *the* Ganeti VG,
bypassing this problem.

Unfortunately, this led Ganeti to report the disks of instances created
on a different VG as non-existent. This patch fixes things by reverting
patch eeda5882

 and making Ganeti warn about orphan volumes only if
they belong to the Ganeti-administered VG.

Signed-off-by: Hrvoje Ribicic <riba@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>