[krbdev.mit.edu #5943] db creation creates a kadmin/hostname princ but doesn't fix case

[Ken Raeburn via RT]

The code trying to authenticate to kadmin/whatever_admin_host will force the hostname to 
lowercase.  But when we create such an entry at database creation time, it appears we use 
whatever case the host (or DNS?) thinks it's name is supposed to be.

Ah, yes, in kadm5_create.c:
  sprintf(service_name, "kadmin/%s", ai->ai_canonname);
The name needs to be forced to lowercase.

So, depending on the returned canonical name, this can probably cause an incompatibility with 
SEAM where we thought we were compatible...