osx: deal with more kerberos damage

osx: deal with more kerberos damage

the number of things which can return success without succeeding is
truly sad.

Reviewed-on: http://gerrit.openafs.org/6911
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 59b57ff85acbef10bcec9724c42e3bad78538687)

Change-Id: I487ece6f991157a95e200f7764027902a2402e7b
Reviewed-on: http://gerrit.openafs.org/6965
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Derrick Brashear <shadow@dementix.org>