Merge pull request #15371 from liewegas/wip-mon-client-features

mon: track features from connect clients, and use it to gate set-require-min-compat-client

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

diff --cc src/common/ceph_strings.cc
Simple merge

diff --cc src/include/rados.h
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/Paxos.cc
Simple merge

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