Attempts to authenticate a user and retrieve attributes associated with the user.
@author Ken Weiner, kweiner@unicon.net
@author Don Fracapane (df7@columbia.edu)Added properties in the security properties file that hold the tokens used to represent the principal and credential for each security context. This version differs in the way the principal and credentials are set (all contexts are set up front after evaluating the tokens). See setContextParameters() also.
@version $Revision: 20532 $Changes put in to allow credentials and principals to be defined and held by each context.
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