private void createAllBuckets() {
    Cache cache = getCache();
    PartitionRegionHelper.assignBucketsToPartitions(cache.getRegion(BASE));
  }
This is a regression test for GEODE-6767 that we can still rebalance after altering certain
partitioned region attributes.

Altering the region attributes changes metadata in the __PR region. If that metadata is
corrupted, rebalance may end up reducing redundancy due to the fact that
isColocationComplete=false
in the metadata.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/partitioned/PartitionedRegionAttributesMutatorDUnitTest.java