rgw: call rgw_store_user_info() with objv_tracker

another rebase casualty

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: radosgw-admin bucket list --bucket lists bucket objects

Also lists tag for each object.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>