octopus: rgwlc: fix segfault resharding during lc

[mkogan1]

backport tracker: https://tracker.ceph.com/issues/54969
backport of: #45391
parent tracker: https://tracker.ceph.com/issues/54363

Signed-off-by: Mark Kogan mkogan@redhat.com
(cherry picked from commit 7d2e72a)

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[mattbenjamin]

oops--sorry, approve :)

[ljflores]

Rados suite results for documentation:

https://pulpito.ceph.com/?branch=wip-yuri-testing-2022-06-21-0703-octopus

All failures were caused by a bug in teuthology, which was fixed.