vircgroup: one central point for adding tasks to cgroups
vircgroup: one central point for adding tasks to cgroups

Use virCgroupAddTaskController in virCgroupAddTask so we have one
single point where we add tasks to cgroups.

Signed-off-by: Henning Schild <778a47b837e7e52b02cff9816e4483fddceca8a5@siemens.com>

nertpinx/libvirt,VenkatDatta/libvirt,taget/libvirt,crobinso/libvirt,eskultety/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,taget/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,jfehlig/libvirt,taget/libvirt,taget/libvirt,datto/libvirt,eskultety/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,datto/libvirt,crobinso/libvirt,eskultety/libvirt,crobinso/libvirt,libvirt/libvirt,libvirt/libvirt,jardasgit/libvirt,datto/libvirt,eskultety/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,datto/libvirt,jardasgit/libvirt,zippy2/libvirt,zippy2/libvirt,VenkatDatta/libvirt,libvirt/libvirt,datto/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,andreabolognani/libvirt,olafhering/libvirt,nertpinx/libvirt,andreabolognani/libvirt,taget/libvirt,eskultety/libvirt,andreabolognani/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,olafhering/libvirt,crobinso/libvirt,olafhering/libvirt,VenkatDatta/libvirt