public static void startSenderInVMs(String senderId, VM... vms) {
    for (VM vm : vms) {
      vm.invoke(() -> startSender(senderId));
    }
  }
Returns a Map that contains the count for number of cache server and number of Receivers.
geode-wan/src/distributedTest/java/org/apache/geode/internal/cache/wan/WANTestBase.java