JDiscContext registerContext(FilterBindings filterBindings, CurrentContainer container, Janitor janitor, Metric metric) {
        JDiscContext context = JDiscContext.of(filterBindings, container, janitor, metric, config);
        contexts.addFirst(context);
        return context;
    }
@author Simon Thoresen Hult
@author bjorncs
container-core/src/main/java/com/yahoo/jdisc/http/server/jetty/JettyHttpServer.java