rgw: better tenant id from the uri on anonymous access

rgw: better tenant id from the uri on anonymous access

When anonymous tries access public bucket, it gets 404,
because rgw doesn't check tenant correctly.

A previous fix for this broke legacy implicit tenants,
because it didn't check for anonymous access.  This version
restricts its behavior to the anonymous user.

Fixes: https://tracker.ceph.com/issues/48001 https://tracker.ceph.com/issues/48382
Original fix by
Author: Rafał Wądołowski <rafal@rafal.net.pl>
Signed-off-by: Rafał Wądołowski <rwadolowski@cloudferro.com>
This fix
Signed-off-by: Marcus Watts <mwatts@redhat.com>
(cherry picked from commit b5880caa505e2df7ff035537c19a8be3a3a8bb8f)