s4: adding a DsdbTestCase class

[Matthias Dieter Wallnöfer]

This is a big step forward which helps to remove redundancies. Please 
apply these changes!

Cheers,
Matthias

Nadezhda Ivanova wrote:
> Hi Jelmer and team,
> In the testsuites in dsdb/tests there is a practise currently that each test
> suite defines its own methods, even if they are the same as the ones used in
> other testsuites, such as delete_force, get_domain_sid and a few others. To
> avoid this, I suggest adding a DsdbTestCase class to samba.tests that
> contains these methods, and all the testsuites that use them to inherit it,
> as is the case with BlackboxTestCase and others. I have added the class
> here:
>
> http://gitweb.samba.org/?p=nivanova/samba.git;a=commit;h=4bf20e6948133c3a53b91da6c18bf597220082c5
>
> And here is what acl and sec_descriptor look like now.
> http://gitweb.samba.org/?p=nivanova/samba.git;a=commit;h=4f09b500b553c16a1d2263c9916c04343cde8522
> http://gitweb.samba.org/?p=nivanova/samba.git;a=commit;h=a6986796fe5c248f642ddb6f855466aed4c03782
>
> If it is OK with everyone, I would like to push this to master and change
> the other testsuites in dsdb/tests to inherit DsdbTestCase too.
>
> Regards,
> Nadya
>
>