Tenant vm goes into error state when Controller and ovs-vapp are stacked using Stable Kilo.

 Unexpected build failure, not rescheduling build.

 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] Traceback (most recent call last):
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/opt/stack/nova/nova/compute/manager.py", line 2248, in _do_build_and_run_instance
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] filter_properties)
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/opt/stack/nova/nova/compute/manager.py", line 2391, in _build_and_run_instance
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] 'create.error', fault=e)
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/opt/stack/nova/nova/compute/manager.py", line 2107, in _notify_about_instance_usage
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] extra_usage_info=extra_usage_info, fault=fault)
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/opt/stack/nova/nova/compute/utils.py", line 309, in notify_about_instance_usage
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] fault_payload = exception_to_dict(fault)
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/opt/stack/nova/nova/compute/utils.py", line 66, in exception_to_dict
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] u_message = utils.safe_truncate(message, 255)
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/opt/stack/nova/nova/utils.py", line 1271, in safe_truncate
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] b_value = encodeutils.safe_encode(value)[:length]
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] File "/usr/local/lib/python2.7/dist-packages/oslo_utils/encodeutils.py", line 76, in safe_encode
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] raise TypeError("%s can't be encoded" % type(text))
 TRACE nova.compute.manager [instance: a41da03e-f3e4-44d3-acb1-67029788ceb9] TypeError: <type 'tuple'> can't be encoded