Merge pull request #7754 from xiexingguo/xxg-wip-14845

osd: fix inaccurate counter and skip over queueing an empty transaction

Reviewed-by: Sage Weil <sage@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/PG.cc
Simple merge

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