Step 'I shutdown Tails and wait for the computer to power off' sometimes fails by rebooting instead

Doing a reboot instead of a shutdown makes the wait for the computer to power off part of the step fail eventually.

I’ve seen this only once (on one of Jenkins’ ISO testers), and it looked like this in the debug log:

[...]
[log] TYPE " "
[log] CLICK on (522,707)
    When I disable the first persistence preset  # features/step_definitions/usb.rb:192
spawning as root: poweroff
[log] Alt+TYPE "î€”"
    And I shutdown Tails and wait for the computer to power off                                              # features/step_definitions/common_steps.rb:555
      VM is still running (Timeout::Error)
[...]

I.e. nothing helpful (and I think Sikuli doing Alt+TYPE "î€”" (= type Alt+F4) that late is just a delay caused by the DEBUG_LOG_PSEUDO_FIFO madness => unrelated). Looking at the video doesn’t reveal anything useful either.

Parent Task: #10288

Original created by @anonym on 12132 (Redmine)

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