NMS-9689: Upgraded Jetty to version 9.4.2.v20170220
NMS-9689: Upgraded Jetty to version 9.4.2.v20170220

This upgrade includes changes to Jetty's HttpConnection class to
avoid exceptions when processing HEAD requests against static
resources.

aihua/opennms,aihua/opennms,aihua/opennms,aihua/opennms,aihua/opennms,aihua/opennms,aihua/opennms,aihua/opennms,aihua/opennms