driver: Do not show a stacktrace to the user if no network.hwaddr is present on container configs

This is enough to close GH-266 since Vagrant will take care of showing
an error informing the user that it was unable to connect to the
machine.
action/boot: Bind mount /sys/fs/pstore to same path on containers to fix some apparmor issues when starting Ubuntu 14.04 containers

Fix GH-278