Merge pull request #7486 from ceph/wip-bluestore-oref

osd: bluestore: fix two wal bugs; reuse OnodeRefs when applying txc

Reviewed-by: xie xingguo <xie.xingguo@zte.com.cn>

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

diff --cc src/msg/simple/Pipe.cc
Simple merge

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

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

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