[security-services] Minor error in core 28

There is a minor error in core-28 regarding Recipient in Response. Here is the 
correction:

Line 1404: Should change the type from dateTime to anyURI.

Line 2224: Remove this line.

Line 2301: Add the following after this line:
	<attribute name="Recipient" type="anyURI" use="optional"/>
	
Emily

Emily Xu
iPlanet, Sun Microsystems, Inc.
408-276-5480