pacman/sync.c : improve the sync db cleanup feature.

This feature (introduced by b118ce55bd01c7ebd42b5b6d4a0f34aa925701d8 as a
part of -Sc) could actually be helpful in the 3.0 -> 3.1 transition, because
all sync dbs will be left in /var/lib/pacman/, while the updated ones will
go to /var/lib/pacman/sync/.
So it'll now clean everything in /var/lib/pacman/, and only the unused
databases in /var/lib/pacman/sync/ (with the exception of local/ and sync/
in both cases).

Note: This feature is undocumented. I wonder if moving it to another option,
something like -S --dbclean, wouldn't help for documenting it.

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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