Provide Simulator for heron api namespace

[aahmed-se]

Currently Simulator is available for the org.spache.storm namespace it should also be available for the heron api namespace

[maosongfu]

We have it under com.twitter.heron namespace: https://github.com/twitter/heron/blob/master/heron/simulator/src/java/com/twitter/heron/simulator/Simulator.java

Do you think we need to move it to heron api? Or add a wrapper on it? (For this, heron api package would still depend on simulator jar, so why don't users use heron.simulator namespace directly?)

[kramasamy]

@aahmed-se - what is the use case?

[aahmed-se]

We want to test topologies written using heron api objects , because that is what we are encouraging more users to do.