(krbhst_get_default_proto): new function, returns udp, or in case
large_msg was requested for the krb5_krbhst_data, use tcp.
(*): if the flag KD_LARGE_MSG was set on the krb5_krbhst_data, avoid
using udp, use krbhst_get_default_proto
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@12928 ec53bebd-3082-4978-b11e-865c3cabbd6b