evacuation confirmed by migration

Registered by suzhengwei

In the host failure workflow, it waits for evacuation confirmation by
vm_state and hypervisor hostname changes of the instance. The confirmation
is not simple and brief.

When calling nova evacuate api, it will produce a migration to sync the
evacuation progress. It can confirm the evacuation by the migration' status.

https://opendev.org/openstack/masakari/src/branch/master/masakari/engine/drivers/taskflow/host_failure.py#L225

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suzhengwei
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