feat(sys-apps/shadow) delete ebuilds

We are using the newer one in portage-overlay, these are here for no
reason, so delete them.
feat(sys-apps/module-init-tools) delete

We are using kmod instead, so just delete module-init-tools entirely,
it's not needed.
feat(sys-apps/debianutils) delete

The ebuilds in portage-stable are newer, if we are even still using this
package (I wasn't able to tell for some odd reason...)
Merge pull request #68 from gregkh/remove_deps

Remove some sys-apps/ ebuilds that are not needed.