Entry scripts return 0 status code on KeyboardInterrupt

[kirilyuro]

Expected Behavior

The scripts should return a non-0 status code when interrupted.

According to the Advanced Bash-Scripting Guide, bin/gimme-aws-creds should return status code 130.
The Windows script bin/gimme-aws-creds.cmd can do the same for consistency, as there doesn't seem to be a convention.

Current Behavior

Currently, the entry script suppresses the KeyboardInterrupt and completes successfully:

    try:
        GimmeAWSCreds().run()
    except KeyboardInterrupt:
        pass

Steps to Reproduce

1. Run gimme-aws-prod.
2. Wait a second or two for script to start doing its thing.
3. Send SIGINT (Ctrl+C).
4. Output exit code (echo $? or whatever your shell is using).
5. => Observe status code 0.

Context

Trying to invoke gimme-aws-creds from another script, and need to make sure that it completes successfully, i.e. that valid aws credentials are present, otherwise my script should fail.