rgw: remove old index update calls

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: remove unused code

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: switch RGWRados::delete_obj() to new interface

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: fix missing state initalization

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: remove more unused code

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
rgw: wip, rework prepare_get_obj(), get_obj()