radtest and IPv6 support

[Alan DeKok]

John Dennis wrote:
> We also just discovered a bug with IPv6 usage in radclient (and
> radtest), you may want to take a look at these two bugzilla's:
> 
> https://bugs.freeradius.org/bugzilla/show_bug.cgi?id=80

  The better fix is to take unknown options starting with "-", and pass
them directly to radclient.  This will make -4 work, -6, and a bunch of
other options.

> https://bugs.freeradius.org/bugzilla/show_bug.cgi?id=82

  Except I'm not allowed to see the redhat bugs.

  From what I can tell, the issue is that ip_hton() does DNS lookups,
and inet_pton() doesn't.

  Alan DeKok.