Description This routine determines the Kerberos realm names for host,
filling in realmlist with a pointer to
an argv[ ] style list of names, terminated with a NULL pointer.
If host is NULL, the local host's
realms are determined.
If there are no known realms for the host, the filled-in pointer
is set to NULL.
The pointer array and strings pointed to are all in allocated
storage, and should be freed by the caller when finished.
Return
Values This routine returns the following KRB5 status code: