sasl_authentication_session_gssapi_test requires that the /etc/hosts entry for 127.0.0.1 begin with 'localhost'. If it does not, it will reverse lookup the wrong hostname to acquire a keytab entry for. If we made the hostname the test originally looked up invalid, then it will be unable to reverse lookup. Then, we won't rely on entries in /etc/hosts.

Note, we'd need a new keytab entry with the new invalid hostname.