Ensure device symmetricNAT field is updated

[vishnoianil]

with add/update device requests

Openapi client generates the model with json tag omitempty, that removes the symmetricNAT flag in the json request body if it's false.

Fixes: #1956

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[chirino]

I don't think this will fix the problem. The issue is in the generated OpenAPI client models.

[chirino]

fixed in #1958`