Boot asset 0.5.13 local dev fails to bring up agent

[linear-code]

With boot asset 0.5.13 in local dev, the guest agent never comes up.

The guest kernel hangs inside the mount syscall when the trampoline (/sbin/init) runs mount -t virtiofs arcbox /arcbox. It stalls inside the mount syscall itself, before the FUSE_INIT request is ever placed into the virtqueue.

As a result the daemon never sees the agent connect and the VM is eventually torn down with timeout waiting for agent.

[linear-code]

ABX-378

[pullfrog]

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