Upgrade to Linux 4.19.16-1 in 3.13

Originally created by @intrigeri on #16371 (Redmine)

It got uploaded yesterday. Depending on when exactly we freeze, we might get it or not in 3.12~rc1 and 3.12. Let’s make a conscious decision about it.

Feature Branch: bugfix/16371-linux-4.19.0-2+force-all-tests

Related issues

Related to #16390 (closed)
Related to #16458 (closed)
Blocks tails/accounting#15507

Edited May 15, 2020 by intrigeri

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