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nexus: update instance networking config after live migration
Whenever Nexus gets a new instance runtime state from a sled agent, compare the state to the existing runtime state to see if applying the new state will update the instance's Propolis generation. If it will, use the sled ID in the new record to create updated OPTE V2P mappings and Dendrite NAT entries for the instance. Retry with backoff when sled agent fails to publish a state update to Nexus. This was required for correctness anyway (see #2727) but is especially important now that there are many more ways for Nexus to fail to apply a state update. See the comments in the new code for more details.
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