public HRegionLocation getDefaultRegionLocation() {
    return locations[RegionInfo.DEFAULT_REPLICA_ID];
  }
Returns the region location from the list for matching regionName, which can be regionName or
encodedRegionName
@param regionName regionName or encodedRegionName
@return HRegionLocation found or null
hbase-client/src/main/java/org/apache/hadoop/hbase/RegionLocations.java