Add a helper script to be able to run "apt-get install" without running

Add a helper script to be able to run "apt-get install" without running 
the maintainer scripts on installed packages.

I've experimented with using this in the install_packages.sh that
runs from outside the targetfs. It is able to extract packages and
make them appear to be installed (for the most part) without
running the maintainer scripts.

This will allow us to start figuring out what problems we will
have when we no longer run the maintainer scripts.

In the long run it would be nice to add an option to "dpkg" to 
skip maintainer scripts.

[tedbo, 2009-12-23 04:42:42]

This will help me get started on identifying issues with installing packages
without running maintainer scripts. I've already found a few issues but have
managed to get a mostly working system with most packages no running maintainer
scripts (on x86).

[Bill Richardson, 2009-12-23 05:17:38]

LGTM