pull up r23681 from trunk

pull up r23681 from trunk

 ------------------------------------------------------------------------
 r23681 | tlyu | 2010-02-01 16:48:19 -0500 (Mon, 01 Feb 2010) | 15 lines

 ticket: 6653
 subject: set_default_enctype_var should filter not reject weak enctypes
 tags: pullup
 target_version: 1.8

 With allow_weak_crypto=false, set_default_enctype_var() (helper
 function for krb5_set_default_tgs_enctypes(), etc.) was rejecting any
 application-provided enctype list that contained any weak enctype even
 when valid strong enctypes were present.  This broke some Samba
 things.  Filter the weak enctypes instead.  Add test cases.

 Reported to Debian by Holger Isenberg. (Debian bug #566977)
 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=566977
 Thanks to Simo Sorce for testing.

ticket: 6653
version_fixed: 1.8
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-8@23704 dc483132-0cff-0310-8789-dd5450dbe970