s4:Randomly failing DRS tests

[Matthias Dieter Wallnöfer]

Hi DRS developers,

while doing some buildfarm analysis I've seen the DRS testsuites beside 
on Linux standard systems unstable and unreliable. I wonder if someone 
from the testwriters could look into this and see if there are fixing 
possibilities.

The tests are:
- samba4.drs.delete_object.python(vampire_dc)
- samba4.drs.fsmo.python(vampire_dc)

Cheers,
Matthias