Test suite: VM sometimes restarts after shutdown
This caused test failures in:
- https://jenkins.tails.boum.org/job/test_Tails_ISO_stable/4691/cucumber-html-reports/report-feature_7_295607190.html
- https://jenkins.tails.boum.org/job/test_Tails_ISO_stable/4685/cucumber-html-reports/report-feature_7_295607190.html
- https://jenkins.tails.boum.org/job/test_Tails_ISO_20276-fix-unexpected-return/1//cucumber-html-reports/report-feature_7_295607190.html
- https://jenkins.tails.boum.org/job/test_Tails_ISO_stable/4730/cucumber-html-reports/report-feature_7_295607190.html
Edited by segfault