MAC address spoofing failure notifications are not always displayed

https://jenkins.tails.boum.org/view/RM/job/test_Tails_ISO_devel/79/
- https://jenkins.tails.boum.org/view/RM/job/test_Tails_ISO_stable/57/

It might be that the problem does not exist on Jessie, so I would recommend checking how it looks like on the branch that unmarks this scenario as fragile in a month or two.

Feature Branch: test/10774-disable-mac-spoofing-notification-tests

Parent Task: #10288

Related issues

Related to #11593 (closed)

Original created by @intrigeri on 10774 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information