In change I9360fe29908, we added the 'numa_policy' field to the
'InstancePCIRequest' object. Unfortunately we did not update the
(de)serialization logic for the 'InstancePCIRequests' object, meaning
this field was never saved to the database. As a result, claiming will
always fail [1].
The resolution is simple - add the (de)serialization logic and tests to
prevent regression.
[1] https://github.com/openstack/nova/blob/18.0.0/nova/compute/resource_tracker.py#L214-L215
Change-Id: Id4d8ecb8fee46b21590ebcc62a2850030cef6508
Closes-Bug: #1805891