Merge pull request #6208 from liewegas/wip-alloc-hints

librados,osd: rados hints for future access pattern

Reviewed-by: Samuel Just <sjust@redhat.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>

diff --cc src/librados/IoCtxImpl.cc
Simple merge

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

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

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

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

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

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

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

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