Start haveged earlier in the boot process

Originally created by @intrigeri on #10779 (Redmine)

On current devel (Jessie) branch, haveged starts relatively late in the boot process. On current sid, starts much earlier, presumably thanks to the changes introduced in 1.9.1-2. Let’s make sure this works fine in Tails 3.x.

Related issues

Related to #7102
Related to #11758 (closed)

Edited May 15, 2020 by intrigeri

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