8006413: Add utility classes for writing better multiprocess tests in jtreg Summary: Add a few utility classes to test/testlibrary to support multi process testing in jtreg tests. Added a test case for one of the utility classes. Also reviewed by Vitaly Davidovich Reviewed-by: brutisso, dholmes, vlivanov, nloodin, mgerdin

public class T
{
  public static boolean foo(boolean bar)
  {
    return bar;
  }

  public static void printIt()
  {
    System.out.println("Hello");
  }
}