Use /dev/vboxdrv from host and don't bother with kernel upgrading

The Virtualbox kernel module should be installed and loaded on host, and
then mounted as volume in guest container.

Signed-off-by: Esben Haabendal <esben@haabendal.dk>
DEBIAN_FRONTEND=noninteractive

Signed-off-by: Esben Haabendal <esben@haabendal.dk>
Add Emacs littering to gitignore

Signed-off-by: Esben Haabendal <esben@haabendal.dk>
Use rastasheep/ubuntu-sshd as base image

Signed-off-by: Esben Haabendal <esben@haabendal.dk>
Drop /vbox volume as there is no obvious use for it

Signed-off-by: Esben Haabendal <esben@haabendal.dk>
Add vagrant

Signed-off-by: Esben Haabendal <esben@haabendal.dk>