provide virtualbox-guest modules and services

[barbieri]

we should provide virtualbox-guest kernel modules and services to improve integration with virtual machine environment, like copying files via mount and so on.

we need to decide if we always do this, if we do via a bundle or we do a specific virtualbox-targeted image.

[mythi]

https://github.com/ostroproject/ostro-os/tree/master/meta-openembedded/meta-oe/recipes-support/vboxguestdrivers