pull up r18801 from trunk

pull up r18801 from trunk

 r18801@cathode-dark-space:  coffman | 2006-11-13 17:59:55 -0500
 ticket: new
 subject: allow server preauth plugin verify_padata function to return e-data
 Component: krb5-kdc
 Target_Version: 1.6
 Tags: pullup

 Change server-side preauth plugin interface to allow the plugin's
 verify_padata function to return e-data to be returned to the client.
 (Patch from Nalin Dahyabhai <nalin@redhat.com>)

 Update sample plugins to return e-data to exercise the code.

 Fix memory leak in the wpse plugin.

ticket: 4738
version_fixed: 1.6

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@18804 dc483132-0cff-0310-8789-dd5450dbe970