@Override
            public Object call() {
              PartitionedRegion pr = (PartitionedRegion) getCache().getRegion(regionPath[0]);
              PartitionedRegionDataStore ds = pr.getDataStore();
              if (ds == null) {
                return 0;
              } else {
                return (int) ds.getBucketsManaged();
              }
            }
Creates partitioned regions in multiple vms and fully exercises the internal-only
getInternalPRDetails API on ResourceManager.
geode-core/src/distributedTest/java/org/apache/geode/cache/management/ResourceManagerDUnitTest.java