r18239: THIS IS GUENTHER'S WORK !!! He's allowing me to merge

r18239: THIS IS GUENTHER'S WORK !!! He's allowing me to merge
this at the moment as I'm working on this area. Thanks
a lot Guenther.
Add the capability to get krb5 tickets even if we
log on in the offline state and have to cache
the credentials. Once we go online we should
start getting krb5 tickets again. Currently
this code waits until lp_winbind_cache_time()
seconds (5 minutes by default) before getting
tickets. This is correct in the DC down case,
but not in the global offline -> online case.
I'll later add a trigger to force an immediate refresh
on the offline -> online state transition.
Jeremy.
(This used to be commit 04fe034f4a222c83a8d788040f7edc370afe9fa6)