2004-09-23  Sebastien Pouliot  <sebastien@ximian.com>

	* TlsClientKeyExchange.cs: Removed .Clear call on private key as itn't
	ours (but only a reference). It also requires the callback to recreate
	a new key object each time (which is worse). This also implies that 
	the caller (implementing the callback) is responsible to clear it.