code: public ConsulResponse<List<CatalogService>> getService(String serviceName, RequestOptions requestOptions) {
          return getService(serviceName, null, null, requestOptions);
      }
docs: Retrieves a single service with {@link io.advantageous.consul.domain.option.RequestOptions}.
  <p>
  GET /v1/catalog/service/{service}
  
  @param serviceName    service name
  @param requestOptions The Query Options to use.
  @return A {@link io.advantageous.consul.domain.ConsulResponse} containing
  {@link io.advantageous.consul.domain.CatalogService} objects.