vm: separate boot time and infrastructure errors

It's not correct to mix them since they point to fundamentally different
issues:
1) Boot time errors are caused by a problematic kernel image and can
   only be resolved by using another kernel version or config.
2) Infrastructure errors are temporary, so we can just try again some
   time later.

Reserve the existing BootError for (1) errors and let all other VM
handling errors refer to (2).

To make it possible to attach more output to the infra error, introduce
the VerboseInfraError type.

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