mgr/volumes: Fix subvolume discover during upgrade
Fixes the subvolume discover to use the correct
metadata file after an upgrade from legacy subvolume
to v1. The fix makes sure, it doesn't use the
handcrafted metadata file placed in the subvolume
root of legacy subvolume.
Co-authored-by: Arthur Outhenin-Chalandre <arthur.outhenin-chalandre@cern.ch>
Co-authored-by: Dan van der Ster <daniel.vanderster@cern.ch>
Co-authored-by: Ramana Raja <rraja@redhat.com>
Signed-off-by: Kotresh HR <khiremat@redhat.com>
(cherry picked from commit
7eba9cab6cfb9a13a84062177d7a0fa228311e13)