Live images now get less packages marked as manually installed

[Julian Andres Klode]

Starting today, live images of cosmic will have most packages
marked as automatically installed instead of manually installed,
so autoremoval works correctly.

The algorithm that does the marking marks all dependencies of
manually installed metapackages as automatically installed, so
it should be entirely safe.

That said, you might want to double check images and installs
from them to see if it looks halfway sane. We can watch this
for some time and if all goes well, backport it to bionic for
the .2 point release.

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