Merge pull request #5173 from ceph/wip-12000-12200

Fast read for erasure coding pool and erasure code error handling

Error handling
Reviewed-by: Loic Dachary <ldachary@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>
Fast Read
Reviewed-by: David Zafman <dzafman@redhat.com>
Reviewed-by: Samuel Just <sjust@redhat.com>

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

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

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

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

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

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

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