Comment 3 for bug 1808228

The issue was reproduced on Horizon.
As a reference I tried "soft reboot"and it worked well.
According to horizon and nova-conductor.log, the request(req-ba2f0c06-2be7-4b9b-8cc3-392304a92eb0) was created and passed to NOVA already.

## hard reboot request received in Nova-conductor
2019-01-14 19:39:13.552 23771 INFO nova.objects.instance_action [req-ba2f0c06-2be7-4b9b-8cc3-392304a92eb0 58318155edc742d888f7ee26affd87a0 f8ad5e7067c24148bae8c084149048fb - default default] compute__do_build_and_run_instance instance 735519d4-ab42-4f66-900e-2428de556b06

## Soft reboot request received in Nova-conductor
2019-01-15 18:28:01.341 23771 INFO nova.objects.instance_action [req-5497b285-88f7-42c6-a8ce-3bc442ca704d 58318155edc742d888f7ee26affd87a0 f8ad5e7067c24148bae8c084149048fb - default default] compute_reboot_instance instance 735519d4-ab42-4f66-900e-2428de556b06

Next step is to investigate why Nova wouldn't proceed this request.