private void stopAServer(String serverName) {
    CommandStringBuilder command = new CommandStringBuilder(CliStrings.STOP_SERVER);
    command.addOption(CliStrings.STOP_SERVER__DIR, serverName);
    gfsh.executeAndAssertThat(command.toString()).statusIsSuccess();
  }
Stops the server for the client Tomcat container is has been connecting to
geode-assembly/src/distributedTest/java/org/apache/geode/session/tests/TomcatClientServerTest.java