Migrate Code to New Random Service Interface

Migrate FastSimulation code to use the new interface
of the random number generator service designed to work
with the multithreaded Framework. The main interface
change is to require a StreamID or LuminosityBlockIndex
argument to the getEngine function. These objects are only
available during the event or beginLuminosityBlock method.
Merge pull request #2620 from wddgit/migrateToNewRandomService5

FastSimulation -- Migrate Code to New Random Service Interface