buildbot steps need description and descriptionDone

[edunham]

Waterfall currently just says "test" on all test steps. It would be better to have a short description of each step, or even just the full text of the command for that step.

Buildbot docs at http://docs.buildbot.net/latest/manual/cfg-buildsteps.html#common-parameters describe description and descriptionDone, and here is an example of them in use.

Steps are created here with configs drawn from here.

@aneeshusa, what's your opinion on whether this should be implemented by adding the information to the yaml file or by inferring it from the commands?

[aneeshusa]

I want to keep the YAML file as simple as possible, so I'd say these should be generated from the commands. Given a shell command such as ./mach build --dev, we can use Running './mach build --dev' for the description, and simply ./mach build --dev for descriptionDone.

I think this could be added to make_step fairly easily.

[aneeshusa]

For description, we could also have this change based on the Step class: Compiling, Testing, Running, and not include the command as the docs say to keep the description field as a single imperfect-tense verb.

[UK992]

I want to claim this

[KiChjang]

@UK992 It's yours!