Merge pull request #25073 from oshynsong/master

rgw: add list user admin OP API

Reviewed-by: Casey Bodley <cbodley@redhat.com>
Reviewed-by: Volker Theile <vtheile@suse.com>

diff --cc qa/tasks/radosgw_admin_rest.py
Simple merge

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

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

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

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