Merge pull request #5047 from rzarzynski/wip-12108

rgw: rework X-Trans-Id header to be conform with Swift API.

Reviewed-by: Yehuda Sadeh <yehuda@redhat.com>

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

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

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

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