private void killServer(ServerType serverType, int port) throws IOException {
    int pid = getServerPID(serverType, port);
    if (pid > 0) {
      LOG.info("Killing " + serverType + "; pid=" + pid);
      killProcess(pid);
    }
  }
Generates a list of random port numbers in the sorted order. A sorted order makes sense if we
ever want to refer to these servers by their index in the returned array, e.g. server #0, #1,
etc.
hbase-diagnostics/src/test/java/org/apache/hadoop/hbase/util/ProcessBasedLocalHBaseCluster.java