ACCUMULO-1689 added the ability to conditionally run the GC. On a production system its expected that the GC is running. Not running it in MAC gives the user a less accurate testing environment. I think we should remove the option for running GC and always run it.
Should also decrease the amount of time the GC waits between collection cycles so that it runs more frequently on MAC. If the GC is going to impact a user in some way, this will increase the chance that they will see it.