Merge pull request #37915 from gregsfortytwo/wip-stretch-fixes

Fix several stretch mode issues

Reviewed-by: Josh Durgin <jdurgin@redhat.com>
Reviewed-by: Neha Ojha <nojha@redhat.com>

diff --cc doc/rados/operations/stretch-mode.rst
Simple merge

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

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

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

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

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