(TK-92) Add graceful-shutdown support

Add graceful-shutdown support to the Jetty9 Webservice. Now,
when the webserver is shutdown, the server will give open
requests a chance to resolve themselves. Allow user to
configure the graceful shutdown stop timeout.
+1 on seconds for granularity.  My understanding was that we were going to have the default at the Jetty level be 30 seconds but have the delay at the init script be 60 seconds.  I think we want the init script one to be a little longer than the Jetty one so that we can make full use of the Jetty timeout and allow users to bump the Jetty one up a bit without having to change the init script one only where needed.