Several properties are added to entity in `DriverBase.make_pickleable`[1]
but the existence check is only applied in `_add_entity_type`.
I think it may not be necessary after we prepended vitrage namespace[2]. I
could not think of a scenario to let user shadow the built-in `entity_type`.
Is there any particular reason for keeping it? Or should we remove it?
@staticmethod
def _add_entity_type(entity, entity_type):
    if DSProps.ENTITY_TYPE not in entity:
        entity[DSProps.ENTITY_TYPE] = entity_type
[1]:
https://github.com/openstack/vitrage/blob/master/vitrage/datasources/driver_base.py#L54
[2]: https://review.openstack.org/#/c/399417/
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