private void printOutRegions(final HRegionServer hrs, final String prefix) throws IOException {
    List<RegionInfo> regions = ProtobufUtil.getOnlineRegions(hrs.getRSRpcServices());
    for (RegionInfo region : regions) {
      LOG.info(prefix + region.getRegionNameAsString());
    }
  }
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