set -e all the things

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
Merge "set -e all the things"