Merge pull request #7465 from liewegas/wip-promote-throttle

osd: probabilistic cache tier promotion throttling

Reviewed-by: Samuel Just <sjust@redhat.com>

diff --cc src/common/config_opts.h
Simple merge

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

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

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

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