test_cls_log: remove warning

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: initialize meta_mgr earlier

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: track object versions between reads and writes

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