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Lock the VM on start. If the machine is in the "starting" state we know that a previous start has failed and guide the user into resolving the issue. Concurrent starts will busy wait and return the expected "already running" error. NOTE: this change is only looking at the start issue (#18662). Other commands such as stop and update should also lock and will be updated in a future change. I expect the underlying issue to apply to all machine providers, not only QEMU. It's desirable to aim for extending the machine interface to also allow to `Lock()` and `Unlock()`. After acquiring the lock, the VM should automatically be reloaded/updated. [NO NEW TESTS NEEDED] Fixes: #18662 Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>