IANA: Try config search by whois server

This essentially adds support for a whole bunch of the new TLDs with
very little work (including future ones run by providers we already
know)

Also corrected the inverted dummy flag on config entries.
Additional whois servers
Improved availability checks

The availability regex setting can now be an array for KeyValue type
templates. This stops the regex getting too large and unmanegable.

Additionally KeyValue type templates can now check for one of a
specified list of values in a specific field (eg. 'not registered' in
the 'status' field)