CVE-2022-37966 tests/krb5: Add 'etypes' parameter to _tgs_req()

CVE-2022-37966 tests/krb5: Add 'etypes' parameter to _tgs_req()

This lets us select the encryption types we claim to support in the
request body.

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>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(similar to commit e0a91dddc4a6c70d7425c2c6836dcf2dd6d9a2de)
[jsutton@samba.org Adapted to 4.17 version of function taking different
 parameters]