The VIM is attempting to live migrate the instances, which is supported for instances with a config drive attached. Nova accepts the live migration request, but then the live migration fails: 
2019-03-20T11:17:10.609 controller-1 VIM_Thread[81893] INFO _instance_director.py.151 Instance action allowed for tenant2-config_drive-5, action_type=live-migrate 
2019-03-20T11:17:10.613 controller-1 VIM_Thread[81893] DEBUG _instance.py.1933 Live Migrate instance tenant2-config_drive-5. 
2019-03-20T11:17:10.613 controller-1 VIM_Thread[81893] INFO _instance_state_initial.py.36 Exiting state (initial) for tenant2-config_drive-5. 
2019-03-20T11:17:10.613 controller-1 VIM_Thread[81893] INFO _instance_state_live_migrate.py.28 Entering state (live-migrate) for tenant2-config_drive-5. 
2019-03-20T11:17:10.614 controller-1 VIM_Thread[81893] DEBUG _instance_task_work.py.131 Live-Migrate-Instance for tenant2-config_drive-5. 
2019-03-20T11:17:10.651 controller-1 VIM_Event-Log_Thread[82063] INFO fm.py.379 Generated customer log, fm_uuid=5f2cfded-3e11-45cc-967e-415780dd6e09. 
2019-03-20T11:17:10.733 controller-1 VIM_Event-Log_Thread[82063] INFO fm.py.379 Generated customer log, fm_uuid=f754ad66-675d-4b75-b381-5647e46da715. 
2019-03-20T11:17:10.811 controller-1 VIM_Thread[81893] DEBUG _vim_nfvi_events.py.235 Instance state-change, nfvi_instance={'attached_volumes': [], 'live_migration_timeout': None, 'name': u'tenant2-config_drive-5', 'recovery_priority': None, 'tenant_id': '018a4f4f-b194-48ba-9d4b-dec5205f280f', 'avail_status': [], 'nfvi_data': {'vm_state': u'active', 'task_state': u'migrating', 'power_state': ''}, 'live_migration_support': None, 'instance_type': None, 'oper_state': 'enabled', 'host_name': u'compute-2', 'admin_state': 'unlocked', 'action': 'migrating', 'image_uuid': None, 'uuid': u'293dbb8b-b3f3-4162-9cae-c328b5852ae5'}. 
2019-03-20T11:17:10.815 controller-1 VIM_Thread[81893] INFO _instance_state_live_migrate.py.114 Live-Migrate starting for tenant2-config_drive-5. 
2019-03-20T11:17:10.815 controller-1 VIM_Thread[81893] INFO _instance_director.py.1601 Instance tenant2-config_drive-5 has recovered on host compute-2. 
2019-03-20T11:17:10.815 controller-1 VIM_Thread[81893] INFO _instance_director.py.1591 Instance tenant2-config_drive-5 state change notification. 
2019-03-20T11:17:10.827 controller-1 VIM_Thread[81893] DEBUG _instance_task_work.py.110 Live-Migrate-Instance callback for tenant2-config_drive-5, response={'completed': True, 'reason': ''}. 
2019-03-20T11:17:10.827 controller-1 VIM_Thread[81893] DEBUG _instance_tasks.py.122 Task (live-migrate-instance_tenant2-config_drive-5) complete. 
2019-03-20T11:17:10.827 controller-1 VIM_Thread[81893] DEBUG _instance_state_live_migrate.py.99 Live-Migrate inprogress for tenant2-config_drive-5. 
2019-03-20T11:17:10.857 controller-1 VIM_Event-Log_Thread[82063] INFO fm.py.379 Generated customer log, fm_uuid=d252c539-3bb9-4ee4-a59d-3629a42900d4. 
2019-03-20T11:17:10.858 controller-1 VIM_Alarm_Thread[82065] INFO fm.py.180 Raised alarm, uuid=541557d8-8658-428d-949a-176a024f38c7, fm_uuid=0d2345c4-431a-460c-ba0f-ba8fe7b8d0f0. 
2019-03-20T11:17:11.832 controller-1 VIM_Thread[81893] INFO _vim_nfvi_audits.py.873 Audit instances called, timer_id=15. 
2019-03-20T11:17:14.780 controller-1 VIM_Thread[81893] DEBUG nfvi_compute_api.py.3324 Instance action-change: instance_uuid=293dbb8b-b3f3-4162-9cae-c328b5852ae5, task_state=migrating, task_status=start, error_msg=None. 
2019-03-20T11:17:14.780 controller-1 VIM_Thread[81893] DEBUG _vim_nfvi_events.py.288 Instance action-change, uuid=293dbb8b-b3f3-4162-9cae-c328b5852ae5, nfvi_action=live-migrate, nfvi_action_state=started, reason=None. 
2019-03-20T11:17:16.997 controller-1 VIM_Thread[81893] DEBUG _vim_nfvi_events.py.235 Instance state-change, nfvi_instance={'attached_volumes': [], 'live_migration_timeout': None, 'name': u'tenant2-config_drive-5', 'recovery_priority': None, 'tenant_id': '018a4f4f-b194-48ba-9d4b-dec5205f280f', 'avail_status': [], 'nfvi_data': {'vm_state': u'active', 'task_state': 'none', 'power_state': ''}, 'live_migration_support': None, 'instance_type': None, 'oper_state': 'enabled', 'host_name': u'compute-2', 'admin_state': 'unlocked', 'action': '', 'image_uuid': None, 'uuid': u'293dbb8b-b3f3-4162-9cae-c328b5852ae5'}. 
2019-03-20T11:17:17.000 controller-1 VIM_Thread[81893] INFO _instance_state_live_migrate.py.120 Live-Migrate no longer in progress for tenant2-config_drive-5. 
2019-03-20T11:17:17.000 controller-1 VIM_Thread[81893] INFO _instance_director.py.908 Migrate of instance tenant2-config_drive-5 from host compute-2 failed. 

Someone from the nova area needs to take a look at the nova logs and determine why nova fails to live migrate the instance.