Merge pull request #19985 from Liuchang0812/osd-pool-stats-in-mgr

mon, mgr: move "osd pool stats" command to mgr and mgr python module

Reviewed-by: John Spray <john.spray@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>

diff --cc src/mgr/ActivePyModules.cc
Simple merge

diff --cc src/mgr/DaemonServer.cc
Simple merge

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