Merge PR #23126 into master

* refs/pull/23126/head:
	wherever: guard handle_conf_change() from concurrent execution
	config: drop config_proxy::lock when invoking config observer

Reviewed-by: Kefu Chai <kchai@redhat.com>

diff --cc src/common/config_proxy.h
Simple merge

diff --cc src/crimson/common/config_proxy.h
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