Same as for commit fcb6a81d,
but for the build of the 'hellorina' SR inside the VM.

This is possible because this SR is only supposed to be run by a test node:
in this case, the owner of the software is the same as for the instance.

Buildout 2.x is required for automatic creation of the 'download-cache' folder.

Anyway, the repository contains more than just rina-tools.

This is implement as a test suite so that it can be automatically on any commit
to rina/slapos repositories.

Currently, the Debian packaging of the kernel only supports Debian Jessie.