fix(vm): close libvirt connections #2392
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Description
Close libvirt connection when we're done.
Motivation
We found a problem with
Too many fileson one of our provider's machines when deploying a deal on it: the nox process has too many open eventfd connections. Further investigation showed that the problem is that theConnectionstruct of thevirtcrate doesn't implementDrop, so the connection isn't closed.Proposed Changes
Auto-close connection.