Live Migration fails with errors, when using rbd for image backend

Issue

• Live Migration fails with errors.

TypeError: libvirt_info() takes exactly 6 arguments (7 given)
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
  **args)
File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
  result = getattr(proxyobj, method)(ctxt, **kwargs) 
File "/usr/lib/python2.6/site-packages/nova/exception.py", line 90, in wrapped
  payload) 
File "/usr/lib/python2.6/site-packages/nova/exception.py", line 73, in wrapped
  return f(self, context, *args, **kw)
File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 4205, in post_live_migration_at_destination
  block_migration, block_device_info)
File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 4269, in post_live_migration_at_destination
  block_device_info, write_to_disk=True)
File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 3070, in to_xml
  disk_info, rescue, block_device_info)
File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2950, in get_guest_config
  inst_type):
File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2727, in get_guest_storage_config
  inst_type)
File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 2690, in get_guest_disk_config
  self.get_hypervisor_version())