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KCM: Set kdc_offset to zero initially
KCM assumed that the client library would always set the KDC offset, but
that's not always the case, especially when using multiple krb contexts
from the client application:
Heimdal also creates ccaches with zero kdc_offset:
so we should do the same..
Reviewed-by: Michal Židek <email@example.com>
Reviewed-by: Robbie Harwood <firstname.lastname@example.org>