netvsp: Set deadline on disconnecting endpoints

[ben-zen]

Some nodes fail to disconnect the VTL2 VF for the MANA NIC; when these failures occur, recovery takes too long for servicing and raises a fault.

The nodes which reach this state currently do so silently; this will highlight other abnormalities in their operation for further investigation, while still allowing the node to progress in servicing.

[Copilot]

Pull request overview

Adjusts NetVSP/MANA VF teardown behavior to avoid long stalls when endpoints fail to disconnect, improving servicing/recovery robustness and surfacing abnormal states via logging.

Changes:

• Add a warning when the DisconnectableEndpoint update receiver is disconnected.
• Add a 10s deadline to disconnecting all endpoints in netvsp so teardown can proceed even if disconnect hangs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
vm/devices/net/net_backend/src/lib.rs	Adds a warning when the update channel disconnects while waiting for endpoint actions.
openhcl/underhill_core/src/emuplat/netvsp.rs	Wraps endpoint disconnect-all in a timeout via mesh::CancelContext to prevent long servicing delays.

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