Revert "remove unecessary upstarts"

 Apparently they were actually necessary.
 Upstart bails after trying to respawn so much when processes exit
 because NATS isn't available, so we reintroduce the scripts that wait on nats.

This reverts commit 4ccc7487c9b917865636d5a7ac872169608fb44f.
Fix typo in comment

Signed-off-by: David Julia <djulia@pivotal.io>