@BeforeClass
  public static void setUpBeforeClass() throws Exception {
    UTIL.startMiniCluster(NUM_SLAVES);
  }
Port of old TestScanMultipleVersions, TestTimestamp and TestGetRowVersions from old testing
framework to {@link HBaseTestingUtil}.
hbase-server/src/test/java/org/apache/hadoop/hbase/TestMultiVersions.java