tests/krb5: Remove harmful and a-typical return in as_req testcase
A test in a TestCase class should not return a value, the
test is determined by the assertions raised.
Other changes will shortly cause kdc_exchange_dict[preauth_etype_info2]
to not always be filled, so we need to remove this
rudundent code.
This also fixes a *lot* of tests against the MIT KDC
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14770
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14817
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
(cherry picked from commit
3330eaf39c6174f2d90fe4d8e016efb97005d1e5)