note about =
use new plugin system for locate kdc plugins (30 as-req/s faster for kdc-tester on MacBookAir5,2)
Make a memory copy of the keytab to avoid unbuffered krb5_storage

300req/s faster (20% performance increase)
enabled the performance hack
default to open/write/close logging
Add -F to kinit for compatibility with MIT Kerberos.