Libvirt produces errors when using rbd for images

Issue

Error found in log when instance is started:

2014-01-24 07:07:55.868 22198 TRACE nova.compute.manager [instance: ac3c0eef-6666-4f59-92fa-c671f36d0d69]   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py";, line 2660, in get_guest_disk_config
2014-01-24 07:07:55.868 22198 TRACE nova.compute.manager [instance: ac3c0eef-6666-4f59-92fa-c671f36d0d69]     self.get_hypervisor_version())
2014-01-24 07:07:55.868 22198 TRACE nova.compute.manager [instance: ac3c0eef-6666-4f59-92fa-c671f36d0d69] TypeError: libvirt_info() takes exactly 6 arguments (7 given)