Merge pull request #21755 from linuxbox2/wip-unordered-gc-delay

rgw: use partial-order bucket listing in RGWLC, add configurable processing delay

Reviewed-by: J. Eric Ivancich <ivancich@redhat.com>
Reviewed-by: Daniel Gryniewicz <dang@redhat.com>

diff --cc src/common/options.cc
Simple merge

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