'set_link net0 off' not working with e1000e driver

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1857226
Reported by 'Jannik' on 2019-12-22 :

I'm encountering a bug with the e1000e network driver, that appears to got
previously reported at rhbz. Steps to reproduce are provided in detail
there:

https://bugzilla.redhat.com/show_bug.cgi?id=1707646

It is about switching off network link state (set_link net0 off) having no
effect when using the e1000e driver.

Version details:
QEMU emulator version 4.1.1 (qemu-4.1.1-1.fc31)
Fedora 31

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