This method initializes the Auth object, given a
dictionary filename to read, the RADIUS host[:port] to connect to, and a
timeout value in seconds for the connection.
|dictfilename:||Dictionary filename to read
|radhost:||name of RADIUS server optionally followed by port number
|myip:||the client's own IP address (NAS IP address)
Verifies a username/password pair against the RADIUS server associated with
the Auth object.
|name:||The user name to verify
|pwd:||The password associated with this name
|secret:||The RADIUS secret of the system
returns true or false depending on whether or not the attempt succeeded or