freeradius-client with IPv6 and DTLS

[Nikos Mavrogiannopoulos]

Hello,
 I've modified the freeradius-client to simplify its API, remove all
IPv4-only legacy code and add DTLS support (rfc7360). The DTLS support
I've tried to add in a transparent way, i.e., an old client could still
have basic DTLS support only by modifying its configuration file. This
is currently experimental code and most likely will have bugs, but I'd
like to see any comments on the approach or possible improvements.

My main concern is that there have been no releases of freeradius-client
for many years, although the intention is to send back the changes as
pull requests to the original repository once they stabilize.

regards,
Nikos

The code: https://github.com/nmav/radiusclient-dtls

Changes since the last release of freeradius-client:
https://github.com/nmav/radiusclient-dtls/blob/master/CHANGES