[krbdev.mit.edu #2772] krb4 APIs do not honor dns_fallback libdefault

[Alexandra Ellwood via RT]

The krb4 APIs do not honor dns_fallback libdefault.  For example, krb_get_krbhst() makes dns 
SRV record requests regardless of the value of dns_fallback in the libdefaults section of the 
configuration file.

This is a problem if the reason you are trying to use "dns_fallback = no" is to avoid using a 
busted res_ninit() ....  :-)