Merge pull request #25833 from vshankar/wip-37762

luminous: config: drop config::lock when invoking config observer

Reviewed-by: Sage Weil <sage@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

diff --cc src/mds/MDSDaemon.cc
Simple merge

diff --cc src/mon/Monitor.cc
Simple merge

diff --cc src/osd/OSD.cc
Simple merge

diff --cc src/osdc/Objecter.cc
Simple merge