Jenkins' isotesters fail to create VMs
Originally created by @anonym on #16843 (Redmine)
Most tests (since we need a VM for almost all tests) are failing like this:
Scenario: Tails will not enable disk swap # features/untrusted_partitions.feature:6
Given a computer # features/step_definitions/common_steps.rb:46
And I temporarily create a 100 MiB disk named "swap" # features/step_definitions/common_steps.rb:59
And I create a gpt swap partition on disk "swap" # features/step_definitions/untrusted_partitions.rb:1
And I plug sata drive "swap" # features/step_definitions/common_steps.rb:66
When I start Tails with network unplugged and I login # features/step_definitions/common_steps.rb:118
Call to virDomainCreateWithFlags failed: internal error: process exited while connecting to monitor: 2019-06-26T07:52:47.558939Z qemu-system-x86_64: Property '.md-clear' not found (Guestfs::Error)
./features/support/helpers/vm_helper.rb:693:in `create'
./features/support/helpers/vm_helper.rb:693:in `/^I start the computer$/'