Display unsupported enctype names

Add a table of unsupported enctype numbers to enctype_util.c and
consult it in krb5_enctype_to_name().  Treat unsupported enctype
numbers as deprecated in krb5int_c_deprecated_enctype().  In kadmin,
display "UNSUPPORTED:" before invalid enctype names.

https://github.com/krb5/krb5/commit/ebbc6e8e99ee9d5d757411200a6a3173171774df
Author: Greg Hudson <ghudson@mit.edu>
Commit: ebbc6e8e99ee9d5d757411200a6a3173171774df
Branch: master
 src/kadmin/cli/kadmin.c           |    4 +++-
 src/lib/crypto/krb/enctype_util.c |   22 +++++++++++++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)