tests/krb5: Make cname checking less strict
Without this additional 'self.strict_checking' check, the tests in the
following patches do not get far enough to trigger a crash with the MIT
KDC.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andreas Schneider <asn@samba.org>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14817
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14817
[abartlet@samba.org backported from commit
36798f5b651a02b74b6844c024101f7a026f1f68 as Samba 4.14 is tested
on MIT 1.16 and so the knownfails need to match this version]