Import www/jetty9 version 9.2.14.v20151106 into pkgsrc.

Jetty provides a Web server and javax.servlet container, plus support for
HTTP/2, WebSocket, OSGi, JMX, JNDI, JAAS and many other integrations.  These
components are open source and available for commercial use and distribution.

This package builds on the existing www/jetty7 package which is retained for
users of that maintenance release, simplifies the packaging, and adds SMF
support.

(jperkin)