syslog_facility.go
func (s SyslogFacility) OK() (ok bool) {
	_, ok = syslogPriorities[strings.ToLower(s.String())]
	return
}
func (s SyslogFacility) OK() (ok bool) {
	_, ok = syslogPriorities[strings.ToLower(s.String())]
	return
}
// OK checks if SyslogFacility is valid.