Update bin/build-aws environment variable names

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Update default AWS AMI

The previously used AMI was a nightly release, which is no longer
available.

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Remove puppet-common from vbox-guest-additions

Signed-off-by: Kris Hicks <krishicks@gmail.com>
Restore old scripts files

Signed-off-by: Kris Hicks <krishicks@gmail.com>