STORM-132 sort supervisor by free slot in desending order

Sort supervisor by free slot in desending order in EvenScheduler to schedule more evenly between supervisor
For the above tests, are we sure the ports will always be returned in ascending order (e.g., 6700...6701...6702...)?

If not, maybe we should just check the supervisor names and not compare the actual port numbers.

If we are sure the port numbers will be in order, then these tests should be OK.