Support re-running of run-once use case.

[edwardps]

Problem

Today, the launched version 1.0 does not support user to re-run a previous run-once job. Without this feature, customer has to create the job from scratch(entering the parameters, env, etc) again if customer simply wants to re-run job. That would impair the user experience especially when user needs to test different configurations at development stage.

Proposed Solution

Please consider supporting the re-run function for a previous run-once job and carry over all the configuration automatically.