@Override
  public boolean exists(GatewayReceiver config, InternalCache cache) {
    return cache.getGatewayReceivers() != null && cache.getGatewayReceivers().size() > 0;
  }
Need to keep this method since we are using the realizer in the GatewayReceiverFunction
geode-core/src/main/java/org/apache/geode/management/internal/configuration/realizers/GatewayReceiverRealizer.java