PDB-342 Use our own JDK repo for JDK 7 testing

Change our acceptance tests so that for Ubuntu 10.04 and Debian 6 we use our
own repository which contains a debian package for JDK 7.

This will allow us to retire the JDK 6 support and still provide testing for
those platforms.

Signed-off-by: Ken Barber <ken@bob.sh>