We're still seeing problems in mkosi CI where we lose notify messages sent over vsock from virtual machines because the virtual machine shuts down before the socket buffers are flushed. Let's try setting SO_LINGER on vsock sockets so that the kernel waits until the buffers are flushed when we close the file descriptor. To make sure it works, let's get rid of our previous workaround that sends EXIT_STATUS earlier to reduce the chance of it not arriving. This way, if it doesn't work, we'll notice it immediately due to CI failures.
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