Daniel Schaefer afbfef93a7 nixos/tests: Ignore shutdown/crash if not booted
Condition seems to be inverted. Crash and shutdown only make sense, when
the machine is booted; i.e. we return immediately otherwise.
In the Perl test driver this is:

    return unless $self->{booted};
2019-11-06 16:06:43 +01:00
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