[Merge] ~toabctl/livecd-rootfs:focal-sshdconfig-lp1968873 into livecd-rootfs:ubuntu/focal

[Thomas Bechtold]

According to https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/2037703/comments/3 , this seems to be ok. 
@Steve, can you merge & upload this one, please?
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https://code.launchpad.net/~toabctl/livecd-rootfs/+git/livecd-rootfs-1/+merge/452352
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