Get upgrade task status for the given task of the given bundle.
Both bundle_name and task_id must be provided, otherwise you
will receive a 404 NOT FOUND response.
GET https://<nsx-mgr>/api/v1/node/upgrade?bundle_name=VMware-NSX-unified-appliance-2.1.0.0.0.6921065&upgrade_task_id=77834e07-7901-4e3d-bfe9-aa1df72cac6b