public static void setIsSlowStart() {
    CacheClientProxy.isSlowStartForTesting = true;
    System.setProperty("slowStartTimeForTesting", "15000");
  }
set the boolean for starting the dispatcher thread a bit later.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/ClientConflationDistributedTest.java