Merge pull request #15137 from theanalyst/rgw/cleanup/header-drop

rgw: drop using std ns in header files and other cleanups

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

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

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

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