JEOS images for bootstrapping Chef

We don't use user-mode networking in production. Instead we use bridged networking. These templates all assume that they are being built with bridged network.

To build these templates on an Ubuntu machine, edit /etc/qemu/bridge.conf and add the line: allow br0.

Also run the following command to allow a non-root user to make use of br0 in packer builds: sudo chmod +s /usr/lib/qemu/qemu-bridge-helper