Merge pull request #48679 from cfsnyder/wip-rgw-multi-obj-del-perf

rgw: concurrency for multi object deletes

Reviewed-by: Yuval Lifshitz <ylifshit@redhat.com>
Reviewed-by: Casey Bodley <cbodley@redhat.com>

diff --cc src/common/options/rgw.yaml.in
Simple merge

diff --cc src/rgw/rgw_op.cc
Simple merge

diff --cc src/rgw/rgw_rados.cc
Simple merge