Filter CAMMAC authdata from non-KDC sources

Also filter auth-indicator authdata values which aren't wrapped in
CAMMACs, although we don't normally expect to see those.

https://github.com/krb5/krb5/commit/a19109fffc70cabcabab00d00bf65ea85fd33e1a
Author: Greg Hudson <ghudson@mit.edu>
Commit: a19109fffc70cabcabab00d00bf65ea85fd33e1a
Branch: master
 src/kdc/kdc_authdata.c          |    2 ++
 src/lib/krb5/krb/authdata_dec.c |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)