Implement DES and 3DES PRF. Patch fromKAMADA Ken'ichi

Currently the DES and 3DES PRF output 16-byte results.  This is
consistent with RFC 3961, but we need to confirm it is consistent with
Heimdal and WG decisions.  See IETF 74 minutes for some discussion of
the concern as it applies to AES and thus possibly all simplified
profile enctypes.

https://github.com/krb5/krb5/commit/6991564a69ba53b12c4efdcc9daf85041f0e2697
Commit By: hartmans
Revision: 22298
Changed Files:
U   trunk/src/lib/crypto/des/Makefile.in
U   trunk/src/lib/crypto/des/des_int.h
A   trunk/src/lib/crypto/des/des_prf.c
U   trunk/src/lib/crypto/etypes.c
U   trunk/src/lib/crypto/t_cf2.comments
U   trunk/src/lib/crypto/t_cf2.expected
U   trunk/src/lib/crypto/t_cf2.in