[v9] fix: SiteDirector acts for a VO

[fstagni]

BEGINRELEASENOTES

*WMS
FIX: SiteDirector acts for a VO

ENDRELEASENOTES

[aldbr]

Looks good, just one question: can we have a VO without any group? If no, I guess we might also remove conditions around self.voGroups such as

DIRAC/src/DIRAC/WorkloadManagementSystem/Agent/SiteDirector.py

Line 230 in dcd89c1

if self.voGroups:

[fstagni]

Thanks for pointing that out. I actually think that self.voGroups was a hack, as written in the comment in the code. So, I removed it now that we can run per VO. CC @atsareg