Merge pull request #10907 from jecluis/wip-mon-features

mon: have mon-specific features & rework internal monmap structures

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

diff --cc src/CMakeLists.txt
Simple merge

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

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

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