public static void launchIfNeeded(int vmCount, boolean launchLocator) {
    NUM_VMS = vmCount;
    launchIfNeeded(launchLocator);
  }
Launch DUnit if not already launched.

@param vmCount specified number of VMs
@param launchLocator determines if default dunit locator should be launched
geode-dunit/src/main/java/org/apache/geode/test/dunit/internal/DUnitLauncher.java