rgw: manifest work

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: fix manifest explicit objs case

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: manifest, multipart

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
test/rgw: manifest fixes

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

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
test/rgw: manifest test, multipart

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