geowebcache.xml sample layers reference demo.boundlessgeo.com/geoserver

[jodygarnett]

Replace this with reference to http://localhost:8080/geoserver for local hosting, adjust jetty:run to use port 8081 for testing alongside a local geoserver. This also works if war deployed into the same tomcat as a localhost geoserver.

[jodygarnett]

This is addressed by #1406 changes during local QA testing.