import kcrap-0.2.3-LNF from upstream tarball

Origin: http://wiki.infn.it/_media/strutture/lnf/dr/calcolo/wireless/kcrap-0.2.3-lnf-k5-1.9.tgz
Hash: sha1 5f7561e2e25d10b5bc11ced97becd12a2340ece0
server: use KRB5_KDB_SRV_TYPE_KDC as the KDB service type

The LDAP backend only supports KDC and ADMIN services.
libkcrap: try to determine our FQDN