Class to setup a number of nameservers that respond to specific DNS queries
(QNAME,QTYPE) by prespecified answers. This class is to be used in test suites
where you want to have servers to show predefined behavior.

If the server will do a lookup based on QNAME,QTYPE and return the specified
data. If there is no QNAME, QTYPE match the server will return a SERVFAIL.

A log will be written to STDERR it contains time, IP/PORT, QNAME, QTYPE, RCODE.