The "I hotplug a network device" step is broken in some environments

For me and intrigeri (Debian Sid, qemu 2.10) it fails consistently (the guest doesn’t detect the device after pluggin), and intrigeri thinks sib (Debian Stretch, qemu 2.8) has been affected, but not consistently.

Related issues

Blocks #13240 (closed)

Original created by @anonym on 14819 (Redmine)

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