environs/cloudinit: fix raring issue
This works around LP bug #1103881, so cloudinit will
succeed on raring, rather than failing to execute
any scripts. The problem seems to be upgrading upstart
causes unexpected failures.
This has been tested live on ec2/eu-west-1 as well.
R=fwereade, rog
CC=
https://codereview.appspot.com/8648047