rgw: remove unused variable

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: cleanup, move init_meta_info() into req_info

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
rgw: forward amz headers of copy request to remote rgw

So that if request has any special conditions, it'll be processed
on the remote gateway

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