func (ds *DNSServer) DeleteA(host string) {
	ds.aMutex.Lock()
	delete(ds.aRecords, ds.qualifyHost(host))
	ds.aMutex.Unlock()
}
func (ds *DNSServer) DeleteA(host string) {
	ds.aMutex.Lock()
	delete(ds.aRecords, ds.qualifyHost(host))
	ds.aMutex.Unlock()
}
// Deletes a host. Note that this is not the FQDN, but a hostname.