message: Add prefix to exported legacy apps
diff: @@ -98,8 +98,9 @@ export class FlogoApplicationDetailComponent implements OnChanges, OnInit {
  return () => this.appDetailService.toEngineSpec(isLegacyExport)
  .then(engineApp => {
  const appName = _.snakeCase(engineApp.name);
  + const fileNameSuffix = isLegacyExport ? '_legacy' : '';
  return [{
  - fileName: `${appName}.json`,
  + fileName: `${appName}${fileNameSuffix}.json`,
  data: engineApp
  }];
  }).catch(errRsp => {
  