Migrating to Jenkins 2.1- AJP support is removed in Winstone 3.0 due to Jetty 9 not supporting AJP

I am moving from Jenkins 1.6.x installation to 2.x. Following error prevents Jenkins from starting Jul 02, 2016 12:51:42 PM org.eclipse.jetty.util.log.JavaUtilLog warn WARNING: Empty contextPath...