Merge pull request #15422 from liewegas/wip-osd-rotational

osd: hdd vs ssd defaults for osd op thread pool

Reviewed-by: Mark Nelson <mnelson@redhat.com>
Reviewed-by: xie xingguo <xie.xingguo@zte.com.cn>

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

diff --cc src/os/bluestore/BlueStore.cc
Simple merge

diff --cc src/os/bluestore/BlueStore.h
Simple merge

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

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