Ensure Tails is not affected by BlueBorne

https://security-tracker.debian.org/tracker/CVE-2017-1000251 (Linux kernel) + https://security-tracker.debian.org/tracker/CVE-2017-1000250 (bluetoothd), aka. https://www.armis.com/blueborne/.

Feature Branch: bugfix/14655-disable-bluetooth

Related issues

Related to #14957
Blocks #13234 (closed)

Original created by @intrigeri on 14655 (Redmine)

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