virt-manager fails to reboot guests (no solution found yet)

https://bugzilla.redhat.com/show_bug.cgi?id=496537
https://bugzilla.redhat.com/show_bug.cgi?id=505719
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/368962

Additional info:

1. Error persists even if selinux is disabled.

2. Error message in log :

tail -F /var/log/messages

libvirtd: 23:19:34.302: error : this function is not supported by the
hypervisor: virDomainReboot

tail -F /var/log/libvirt/qemu/guest.log

Nothing.

2. Shutdown does nothing , guest still running, no error message.

3. Force off -> error message / warning -> restart guest is only option.