Schedule advanced success check

[kpetremann]

Due to a Salt inconsistency, a failing scheduled job can report to be successful.

For a Scheduled Job, sometimes a failing jobs can have either:

• retcode=0
• success=True
• no retcode defined in each function of the state

The most precise way to know the real status is to parse the "result" field in Event.Return, meaning get the "result" boolean provided in each function of the state.

For example, if we have the given state:

  dummy test:
    test.nop:
      - name: "nop"

  success:
    test.succeed_with_changes:
      - name: "success"

  failed:
    test.fail_with_changes:
      - name: "failed"

We get the "result", which is a boolean, for the dummy test, success and failed. If one of them returns "false", we consider the state failed.