Log Message:
Update security/cyrus-saslauthd to 2.1.21.  Changes from version 2.1.20
include:

* saslauthd/lak.c: leak fix from Igor Brezac
* saslauthd/krbtf.c: updated from CMUCS
* saslauthd/auth_krb5.c: log the krb5 error return if get_creds fails
* saslauthd/auth_krb5.c, saslauthd/auth_krb4.c,
  saslauthd/krbtf.h (added), saslauthd/krbtf.c (added),
  saslauthd/cfile.h (added), saslauthd/cfile.c (added),
  saslauthd/Makefile.am: Kerberos V4/V5 alternate keytab
  in saslauthd, plus common code merging (from David Eckhardt
  via Dale Moore)
* saslauthd/auth_krb5.c: verify against the service we
  were passed. needs to be made configurable.