Merge pull request #14727 from voidbag/wip-voidbag-bdev-discard

os/bluestore: add discard method for ssd's performance

Reviewed-by: Wido den Hollander <wido@42on.com>
Reviewed-By: Sage Weil <sage@redhat.com>

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

diff --cc src/common/options.cc
Simple merge

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

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