Implement functionality to validate old edge modules have stopped running

[liliankasem]

IoT Edge Module Deployment: Find way to validate old edge modules have stopped before checking if new modules have started

Currently in our edgeSmokeTest we are sleeping after we validate that all the new layered deployments have been created. This is to give time for all the old edge modules to stop before we check if our new modules are up and running.

Ideally there is a better way to do this other than sleeping. Investigate that and perhaps apply a fix.