glg.go
func CustomLogf(level string, format string, val ...interface{}) error {
	return glg.out(glg.TagStringToLevel(level), format, val...)
}
func CustomLogf(level string, format string, val ...interface{}) error {
	return glg.out(glg.TagStringToLevel(level), format, val...)
}
// CustomLogf outputs formatted custom level log