Allow to replay workflow steps even if they are not in error

[laurentganne]

Following pull request #754 allowing to replay workflow steps in error, it is also interesting to allow to replay workflow steps that are not in error.

For example, in the lifecycle operations of a job, this job is created, submitted, then a step "run" performs the asynchronous monitoring of the job status, until the job ends on success or on failure.
If the job fails, the run "step" will fail.
But there is no interest in replaying this "run" step, that is just monitoring a job status.

To replay the workflow, the user would need to be able to resubmit the job, although the step submitting the job was successful in the first execution.

[laurentganne]

Merged #772