solver3: Handle previously satisfied Suggests last

In #2103556 we can see that avahi-daemon Suggests avahi-autoipd,
which is previously satisfied by dhcpcd-base due to a Provides;
that Provides has now been dropped; and solver3 keeps the update
back.

As in LP: #2102720 this is a Suggests and it seems wrong for the
Suggests to actually influence dependency choices and be able to
hold back updates.

Instead, satisfy previously satisfied Suggests at the end. For the
particular case in this bug report, this results in avahi-autoipd,
the real package, to be installed to keep the Suggests working
which needs further consideration whether that is the right choice
(we can argue either way), but in any case this is a better solution.

This in turn breaks the conkeror test which is a somewhat awkward
unrealistic test these days as it has no automatically installed
packages; because previously something must have had a Suggests
on say libdatrie1 or something that was processed first.

This would be fine before 5daf6dbfd272be2f8e3c59d4bab4be8c119b7aa1
but as of that commit we no longer rewrite

    conkeror Depends xulrunner-1.9 | xulrunner-1.9.1

into

    conkeror Depends xulrunner-1.9.1 | xulrunner-1.9

Because xulrunner-1.9 is manually installed. Mark xulrunner-1.9
as automatically installed to fix the test case.

The resulting behavior seems correct: If you manually want
xulrunner-1.9 specifically we should not replace it with
xulrunner-1.9.1; but if it's automatically installed we should.

LP: #2103556

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