Merge pull request #15436 from liewegas/wip-versions

mon: {mon,osd,mds} {versions,count-metadata}

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

diff --cc qa/workunits/cephtool/test.sh
Simple merge

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

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

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

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

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