[INTERNAL] add project.internal package

Change-Id: I71ec59b91b138c0cb630846a15eb5c8c9c0cb590
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1696
Tested-by: Jenkins CI
Reviewed-by: Holger Schmeisky <google@schmeisky.com>
Reviewed-by: Arndt Lasarzik <alasarzik@gmail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>