Protection against doing bad stuff to the root group
Protection against doing bad stuff to the root group

Add protection such that the virCgroupRemove and
virCgroupKill* do not do anything to the root cgroup.

Killing all PIDs in the root cgroup does not end well.

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

jardasgit/libvirt,libvirt/libvirt,rlaager/libvirt,olafhering/libvirt,taget/libvirt,nertpinx/libvirt,elmarco/libvirt,eskultety/libvirt,elmarco/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,agx/libvirt,VenkatDatta/libvirt,olafhering/libvirt,nertpinx/libvirt,olafhering/libvirt,agx/libvirt,eskultety/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,shugaoye/libvirt,taget/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,cbosdo/libvirt,zippy2/libvirt,datto/libvirt,elmarco/libvirt,taget/libvirt,zippy2/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,rlaager/libvirt,olafhering/libvirt,nertpinx/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,crobinso/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,fabianfreyer/libvirt,libvirt/libvirt,cbosdo/libvirt,agx/libvirt,zippy2/libvirt,jardasgit/libvirt,rlaager/libvirt,crobinso/libvirt,andreabolognani/libvirt,agx/libvirt,zippy2/libvirt,rlaager/libvirt,libvirt/libvirt,libvirt/libvirt,jfehlig/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,crobinso/libvirt,datto/libvirt,eskultety/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,cbosdo/libvirt,crobinso/libvirt,eskultety/libvirt,agx/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,datto/libvirt,taget/libvirt,jfehlig/libvirt,eskultety/libvirt,elmarco/libvirt,datto/libvirt,jardasgit/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,taget/libvirt,jardasgit/libvirt,nertpinx/libvirt,jfehlig/libvirt