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This captures the Tails Upgrader errors and debugging information.

Having the fail-safe in tails-unblock-network means that it's only run
*once*, there will be no fail-safe for devices hotplugged after
that. Now we have the fail-safe for each device, right after we try to
spoof them.

Note that we drop `set -u` because /usr/bin/gettext.sh uses the
uninitialized `ZSH_VERSION` variable.

Without this it'll be hard to debug WhisperBacks about issues with MAC
spoofing.

We're seeing more and more systems with multiple audio outputs,
and the default one not being what the user would like.
Let's give ourselves some more room for investigation
and for forwarding bugs upstream if needs be.

This was asked some time ago and waiting for an infrastructure
enabling its implementation