groupadd virtadmin
usermod -a -G virtadmin davec

uid=500(davec) gid=500(davec) groups=500(davec),36(kvm),501(virtadmin)

Remote libvirt SSH access]
Identity:unix-group:virtadmin
Action:org.libvirt.unix.manage
ResultAny=yes
ResultInactive=yes
ResultActive=yes

polkit.addRule(function(action, subject) {
  if (action.id == "org.libvirt.unix.manage" &&
  subject.local &&
  subject.active &&
  subject.isInGroup("virtadmin")) {
      return polkit.Result.YES;
  }
});

[davec@polar rules.d]$ virsh -c xen:///
error: failed to connect to the hypervisor
error: internal error: DBus support not compiled into this binary

[davec@polar rules.d]$ sudo virsh -c xen:///
Welcome to virsh, the virtualization interactive terminal.