Merge pull request #15533 from liewegas/wip-crush-version

mon,osd: add crush_version to OSDMap, and allow crush map updates to gate on crush_version

Reviewed-by: Loic Dachary <loic@dachary.org>

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

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

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

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

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