apt-native: don't let dpkg overwrite files by default

With --force-overwrite (implied by --force-all), dpkg will not abort
when a package overwrites files from different packages. As this can
also lead to "The following package disappeared from your system as
all files have been overwritten by other packages: <package>" and
subsequently broken dependencies, this makes the simple case of
conflicting files hard to debug.

Instead of finding all possibly required force options, only disable
overwrite for now.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Take back from https://git.openembedded.org/openembedded-core/commit/?id=4292387ef6c4e80428bad6a07c844a288b27d9a1


Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>