Merge pull request #16521 from myoungwon/wip-objecter-finishers

osd: add multiple objecter finishers

Reviewed-by: Liu-Chunmei <chunmei.liu@intel.com>
Reviewed-by: Sage Weil <sage@redhat.com>

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

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

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