Merge pull request #5339 from xinxinsh/wip-use-throttle

use throttle framework to throttle objectstore ops/bytes

Reviewed-by: Li Wang <liwang@ubuntukylin.com>
Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/os/FileStore.cc
Simple merge

diff --cc src/os/FileStore.h
Simple merge

diff --cc src/os/KeyValueStore.cc
Simple merge

diff --cc src/os/KeyValueStore.h
Simple merge