One cause of krb5 test suite slowness on some systems

[Sam Hartman]

For the prng issue, it's difficult to fix in prng.c because you don't
typically have a krb5_context (and thus profile) in all the calls to
the prng routines.  (They do take context arguments, but people are
sloppy about supplying them, in part because of the old DES
interfaces).

However, you could fix it in kadmind.  We could have a krb5.conf
setting that tells kadmind not to use /dev/random.