Backport test suite portion of r23361 from trunk

Backport test suite portion of r23361 from trunk

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 r23361 | tlyu | 2009-11-25 22:54:59 -0500 (Wed, 25 Nov 2009) | 15 lines

 ticket: 6584
 target_version: 1.7.1
 tags: pullup

 Pullup to 1.7-branch is only for the test case, as krb5-1.7 behaved
 correctly for these checksums.

 Fix regression in MD4-DES and MD5-DES keyed checksums.  The original
 key was being used for the DES encryption, not the "xorkey".  (key
 with each byte XORed with 0xf0)

 Add a test case that will catch future regressions of this sort, by
 including a verification of a "known-good" checksum (derived from a
 known-to-be-interoperable version of the implementation).

ticket: 6584
version_fixed: 1.7.1

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@23642 dc483132-0cff-0310-8789-dd5450dbe970