hooks: update motd handling and remove 50-motd-news#118

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mvo5 wants to merge 3 commits intocanonical:masterfrom

mvo5:motd-extra-careful

Commits on Sep 7, 2020

Commits on Sep 8, 2020

hooks: rework /etc/update-motd.d/ test to be more precise (thanks to Samuele)
mvo5
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