Failing to deploy cluster should mark node start task as failed

[timotheeguerin]

There are many errors that could happen when deploying a new cluster that just get silently ignored.

We should make sure the node gets into StartTaskFailed state if any of the following happens:

• [ ] Unable to elect master
• [ ] Any errors in the docker container
• [ ] Plugin fails? Maybe a flag to have it fail the deployment if something goes wrong in it