func (ds *DNSServer) SetA(host string, ip net.IP) {
	ds.aMutex.Lock()
	ds.aRecords[ds.qualifyHost(host)] = ip
	ds.aMutex.Unlock()
}
func (ds *DNSServer) SetA(host string, ip net.IP) {
	ds.aMutex.Lock()
	ds.aRecords[ds.qualifyHost(host)] = ip
	ds.aMutex.Unlock()
}
// Sets a host to an IP. Note that this is not the FQDN, but a hostname.