JERSEY-2159: Support Jetty 9 based Jersey Server container.

 - Updated JettyHttpContainerFactory APIs to be consistent with Grizzly container factory.
 - Added support for Jetty Servlet Container. This completes all the common integration points with Jetty.
 - Updated BOM to included jersey-container-jetty-servlet and jersey-test-framework-provider-jetty modules.
 - Updated docbook dependecies to include jetty-servlet module.