private HRegionServer getOtherRegionServer(final SingleProcessHBaseCluster cluster,
    final HRegionServer notThisOne) {
    for (RegionServerThread rst : cluster.getRegionServerThreads()) {
      HRegionServer hrs = rst.getRegionServer();
      if (hrs.getServerName().equals(notThisOne.getServerName())) continue;
      if (hrs.isStopping() || hrs.isStopped()) continue;
      return hrs;
    }
    return null;
  }
Find regionserver other than the one passed. Can't rely on indexes into list of regionservers
since crashed servers occupy an index.
@return A regionserver that is not <code>notThisOne</code> or null if none found
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransactionOnCluster.java