432777 - Async Write Loses Data with HTTPS Server.

Fixed by properly flipping the aggregate buffer when copying bytes to it.
432993 - Improve handling of ProxyTo and Prefix parameters in ProxyServlet.Transparent.

Fixed case of empty context path and missing Prefix parameter.
432777 - Async Write Loses Data with HTTPS Server.

Fixed by properly flipping the aggregate buffer when copying bytes to it.
Merged branch 'jetty-9.1.x' into 'master'.