Merge pull request #17748 from tchaikov/wip-mon-constness

mon: more constness

Reviewed-by: Joao Eduardo Luis <joao@suse.de>
Reviewed-by: Jos Collin <jcollin@redhat.com>

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

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

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

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