Merge pull request #21999 from myoungwon/wip-manifest-unset-op

osd, librados: add unset-manifest op

Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/include/rados/librados.hpp
Simple merge

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

diff --cc src/osdc/Objecter.h
Simple merge

diff --cc src/test/librados/tier.cc
Simple merge

diff --cc src/tools/rados/rados.cc
Simple merge