CoA-Request and Disconnect-Request in the server

[Alan DeKok]

  Thanks to a sponsor (details to follow), the server now has limited
support for CoA-Request and Disconnect-Request.

  The functionality enables you to define policies that *originate* a
CoA-Request or Disconnect-Request.  i.e. "if user has used their
bandwidth quota for the month, disconnect them".

  As always, there are some caveats:

* the server cannot RECEIVE CoA requests.
* the server cannot therefore PROXY CoA requests
* the NAS MUST support CoA for this to work
* The NAS must be listed as a "home_server" of type "CoA".

  See raddb/sites-enabled/originate-coa for more details.

  Alan DeKok.