Check getrandom() status and potential problems

Originally created by @intrigeri on #15681 (Redmine)

Look into potential regressions caused by the getrandom() fix for https://security-tracker.debian.org/tracker/CVE-2018-1108.

Related bugs (some mostly as examples, but some have fixes we might want):

plymouth: https://bugs.debian.org/897572
slow boot blocking startup of the GNOME session: https://bugs.debian.org/897632
arc4random_buf() bug that affects many programs: https://bugs.debian.org/898088
some services cannot start: https://bugs.debian.org/897599, https://bugs.debian.org/897917
util-linux 2.32 should help: https://bugs.debian.org/897572#184
the Fixing Linux getrandom() in stable thread on debian-devel@ has more examples, context and explanations

Edited May 15, 2020 by intrigeri

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