Using set -e in all of our scripts will prevent some subtle bugs
from slipping in, and will allow us to enforce use of set -e with
tooling.
This change also adds -u and set -o pipefail in the less complex
scripts where it is unlikely to cause problems. A follow-up change
will enable those options in the complex scripts so that if it
breaks something it can be reverted easily.
Change-Id: I0ad358ccb98da7277a0ee2e9ce8fda98438675eb
Previously debconf was used and thus this only worked on dpkg based
systems. Now we can support any system that runs a reasonably recent
cloud-init.
Change-Id: I1397aefb3af400adcfd98f858c5a32fad2b584b5
Disables cloud-init from querying EC2 metadata, or any cloud metadata
service. It keeps only the Nocloud and None data sources, which are both
expected to be "baked in" to an image. This speeds up boot by 2 minutes
on hosts where cloud-init cannot reach the EC2 metadata service.
Change-Id: I43522c4a442c0f2fc2044d4898768ceb4f839099
