python: Make credentials cache test run against Windows
Windows, unlike Samba, requires the service principal name to be set
when requesting a ticket to that service.
Additionally, default_realm from the libdefaults section of krb5.conf
should be set so that the correct realm is used.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed May 19 02:22:01 UTC 2021 on sn-devel-184