private RegionInfo createBasic3FamilyHRegionInfo(final TableName tableName) {
    return RegionInfoBuilder.newBuilder(tableName).build();
  }
Creates an HRI around an HTD that has <code>tableName</code> and three column families named
'a','b', and 'c'.
@param tableName Name of table to use when we create HTableDescriptor.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestWALReplay.java