On EC2-VPC we have the ability to attach multiple addresses to one
interface, and multiple interfaces to one machine.
We should configure those interfaces whenever our system boots, and
ideally whenever networking is restarted.
This commit adds a script that is executed once eth0 is brought up that
proceeds to configure all subsequent interfaces, real and virtual.
The script is configured to be installed (along with the helper script
that calls it) on all systems via Puppet.
(imported from commit fdc153ef649edbb8fedd40ff4d77262aae593c39)
Luke Faraone