Merge pull request #22967 from linuxbox2/wip-slo-nosize

rgw: Swift SLO size_bytes member is optional

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

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

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

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

diff --cc src/rgw/rgw_rest_swift.h
Simple merge