GUAC-236: Layers should be parented to default layer by default.
GUAC-236: Layers should be parented to default layer by default.

mike-jumper/incubator-guacamole-server,apache/guacamole-server,apache/guacamole-server,flangelo/guacamole-server,flangelo/guacamole-server,flangelo/guacamole-server,mike-jumper/incubator-guacamole-server,apache/guacamole-server,glyptodon/guacamole-server,flangelo/guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,glyptodon/guacamole-server