Allowing unsigned packages

This should allow the installation of smbios* packages, despite the
unauthenticated status.
In APT, maybe it is possible to allow unsigned package for an identified
list of packages, but I don't know how.
Web interface installation

This will also install and run the web insterface to manage the servers
Include APT module and fix ordering

- This manifest needs the camptocamp::apt module.
- Adding a dependency between package and package source