code: public ConsulResponse<List<CatalogService>> getService(@SuppressWarnings("SameParameterValue") final String serviceName) {
          return getService(serviceName, null, null, RequestOptions.BLANK);
      }
docs: Retrieves a single service.
  <p>
  GET /v1/catalog/service/{service}
  
  @param serviceName service name
  @return A {@link io.advantageous.consul.domain.ConsulResponse} containing
  {@link io.advantageous.consul.domain.CatalogService} objects.