public final List<BindingPattern> getClientBindings() {
        return Collections.unmodifiableList(clientBindings);
    }
Models a jdisc RequestHandler (including ClientProvider).
RequestHandlers always have at least one server binding,
while ClientProviders have at least one client binding.

@author gjoranv
config-model/src/main/java/com/yahoo/vespa/model/container/component/Handler.java