Remove axfrdns-conf program

Removed the 'axfrdns-conf' tool as it is no longer required; thus
not used.
Remove walldns-conf program

Removed the 'walldns-conf' tool as it is no longer required; thus
not useful.
Remove rbldns-conf program

Removed the 'rbldns-conf' tool as it is no longer required; thus
not useful.
Remove tinydns-conf program

Removed the 'tinydns-conf' tool as it is no longer required; thus
not useful.
Remove dnscache-conf program

Removed the 'dnscache-conf' tool as it is no longer required; thus
not useful. Also removed various other sources which were earlier
used by all the configuration '*-conf' tools.