JettyHttpProducer - Sending sync using waitForDone should cater for connection failures

Even though we follow the Jetty documentation it will make the jetty http producer appear as blocked as waitForDone() will block when connection failure occurred.

We need to add logic which polls the status instead and thus can detect the problem.

The async producer done not have this issue by which is likely the main use case for using Jetty as a client