Comment 0 for bug 1716903

Step 1 create instance in cell1
+--------------------------------------+--------+-----------+------------+-------------+---------------------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+--------+-----------+------------+-------------+---------------------------------+
| 84038890-8d70-45e1-8240-2303f4227e11 | yikun1 | MIGRATING | migrating | Running | public=2001:db8::a, 172.24.4.13 |
+--------------------------------------+--------+-----------+------------+-------------+---------------------------------+

Step 2 live migrate instance
nova live-migration 84038890-8d70-45e1-8240-2303f4227e11

Step 3
The instance will stuck in "MIGRATIING" state.
+--------------------------------------+--------+-----------+------------+-------------+---------------------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+--------+-----------+------------+-------------+---------------------------------+
| 84038890-8d70-45e1-8240-2303f4227e11 | yikun1 | MIGRATING | migrating | Running | public=2001:db8::a, 172.24.4.13 |
+--------------------------------------+--------+-----------+------------+-------------+---------------------------------+

It seems we need add @targets_cell decorator for **live_migrate_instance** methods in conductor:
https://github.com/openstack/nova/blob/master/nova/conductor/manager.py#L378

ERROR LOG:
Exception during message handling: InstanceActionNotFound: Action for request_id req-5aa03558-ae14-458e-9c35-c3d377c7ce45 on instance 84038890-8d70-45e1-8240-2303f4227e11 not found
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 160, in _process_incoming
    res = self.dispatcher.dispatch(message)
  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 213, in dispatch
    return self._do_dispatch(endpoint, method, ctxt, args)
  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 183, in _do_dispatch
    result = func(ctxt, **new_args)
  File "/opt/stack/nova/nova/compute/utils.py", line 875, in decorated_function
    with EventReporter(context, event_name, instance_uuid):
  File "/opt/stack/nova/nova/compute/utils.py", line 846, in __enter__
    self.context, uuid, self.event_name, want_result=False)
  File "/usr/local/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 184, in wrapper
    result = fn(cls, context, *args, **kwargs)
  File "/opt/stack/nova/nova/objects/instance_action.py", line 169, in event_start
    db_event = db.action_event_start(context, values)
  File "/opt/stack/nova/nova/db/api.py", line 1957, in action_event_start
    return IMPL.action_event_start(context, values)
  File "/opt/stack/nova/nova/db/sqlalchemy/api.py", line 250, in wrapped
    return f(context, *args, **kwargs)
  File "/opt/stack/nova/nova/db/sqlalchemy/api.py", line 6155, in action_event_start
    instance_uuid=values['instance_uuid'])
InstanceActionNotFound: Action for request_id req-5aa03558-ae14-458e-9c35-c3d377c7ce45 on instance 84038890-8d70-45e1-8240-2303f4227e11 not found