action/fetch_ip_with_lxc_attach: Attach to the MOUNT namespace in order to fix GH-300
driver/cli: Deal with namespaces args for lxc-attach when the sudo wrapper script is in place [GH-300]
command/sudoers: Move wrapper string out to a template and use the full path to the scripts in order to make things work properly across different distros

Closes GH-304
Closes GH-305
driver: Remove calls to  in favor of Vagrant's built in graceful halt
Fix the build