s4/torture: Prepare to handle Level 4 check with unknown func code

s4/torture: Prepare to handle Level 4 check with unknown func code

A future (next) commit will change the NETLOGON_CONTROL_SET_DBFLAG test
to use levels 1 - 4 (current test just tests 1 - 3). A side affect of
this test is that the following test will now test passing an unknown
function code against against Level 4 (previously level 3).

Unfortunately s4 and s3 netlogon server results differ when handling
a level 4 request with an unknown function code.
  s3 server returns WERR_NOT_SUPPORTED and
  s4 server returns WERR_INVALID_PARAMETER.

For level 3 both return WERR_NOT_SUPPORTED.

MS-NRPC doesn't seem to specifically indicate the required response in
this case.

this commit modifies the test to cater for either response (for either
level) A future commit could explore the test response combinations more
thorougly.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15465
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>