Mark sd-proxy as a service VM so the updater will restart it

[legoktm]

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Description

The updater shuts down all VMs with template updates, but only restarts the ones marked as servicevm (usually sys-*), which sd-whonix is.

We should do the same for sd-proxy, which effectively is also a stateless service VM that just provides networking for the client.

Steps to Reproduce

Run the updater, which shuts down sd-proxy. Open the client and log in.

Expected Behavior

Log in request is sent immediately and you log in.

Actual Behavior

Need to wait for sd-proxy to start so the RPC call can fire off the request. If this takes too long (plus tor weather), it's possible the TOTP will expire before the request makes it to the server.

Comments

I assume we can trivially set this via salt.