When sending a packet, ensure that the authentication vector

	When sending a packet, ensure that the authentication vector
	from the packet sent on the wire is copied to the vector entry
	in the RADIUS_PACKET data structure.  This allows us to later use
	that vector for verification.

	Re-arranged the verification code, so that the Message-Authenticator
	(if present) is verified prior to the authentication vector.  This
	allows the Message-Authenticator verification code to set the
	contents of the attribute to zeros, which is what their contents
	are when the authentication vector is calculated.

	Calculate the Accounting-Response authentication vector, in
	exactly the same was for the Authentication-Accept and
	Authentication-Reject vectors