net, tests, hot-plug: W/A guest-agent deadlock on hot-plugged interfaces - #5584

utilities-unittests: OK ✔ in 22 minutes 5.49 seconds
pytest-check-arm64: OK ✔ in 22 minutes 13.4 seconds
pytest-check-s390x: OK ✔ in 22 minutes 19.58 seconds
pytest-check-multiarch: OK ✔ in 22 minutes 44.22 seconds
pytest-check-x86: OK ✔ in 27 minutes 48.8 seconds
  pytest-check-x86: OK (1668.80=setup[784.66]+cmd[616.84,20.44,12.92,11.30,6.49,5.88,5.60,9.19,147.76,47.72] seconds)
  pytest-check-arm64: OK (1333.40=setup[729.63]+cmd[603.77] seconds)
  pytest-check-s390x: OK (1339.58=setup[729.07]+cmd[610.51] seconds)
  pytest-check-multiarch: OK (1364.22=setup[717.16]+cmd[617.61,18.53,10.92] seconds)
  unused-code: OK (1902.99=setup[1858.72]+cmd[44.27] seconds)
  utilities-unittests: OK (1325.49=setup[717.14]+cmd[608.23,0.13] seconds)
  congratulations :) (1903.96 seconds)