Changing external methods to no longer throw UnsupportedOperationException

[Darrel Schneider]

Is it okay, in a minor release, to implement Region.getStatistics for
partitioned regions? See GEODE-2685. The current behavior is for it to
always throw UnsupportedOperationException. I doubt that any application is
depending on that behavior but it could be. I know we have seen changes
like this in the past break the tests of other products that are layered on
top of Geode.
Should this type of change be considered one that breaks backwards
compatibility?