CVE-2022-37966 selftest: Don't strictly check etype-info when obtaining a TGT

CVE-2022-37966 selftest: Don't strictly check etype-info when obtaining a TGT

This padata type is less well tested in Samba 4.15 than we should like,
and hence the encryption type tests reveal some inconsistencies that
cause the tests to fail. Not strictly checking them in these tests
allows them to continue passing.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15237

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
[This is 4.15 only]