private Table createTableAndWait(TableName tableName, byte[] cf)
    throws IOException, InterruptedException {
    Table t = TESTING_UTIL.createTable(tableName, cf);
    awaitTableRegions(tableName);
    assertTrue("Table not online: " + tableName, cluster.getRegions(tableName).size() != 0);
    return t;
  }
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