No warning(s) in the output file with -quiet option. Report command (#885)

report/util.go

@@ -104,6 +104,10 @@ func formatOneLineSummary(rs ...models.ScanResult) string {
 				r.FormatServerName(), r.Warnings))
 		}
 	}
+	// We don't want warning message to the summary file
+	if config.Conf.Quiet {
+		return fmt.Sprintf("%s\n", table)
+	}
 	return fmt.Sprintf("%s\n\n%s", table, strings.Join(
 		warnMsgs, "\n\n"))
 }