@AfterClass
  public static void postClass() {
    invokeInEveryVM(() -> {
      if (instance.cache != null) {
        instance.cache.close();
      }
      instance = null;
    });
    if (instance.cache != null) {
      instance.cache.close();
    }
    instance = null;
  }
Tests cacheserver ssl support added. See https://svn.gemstone.com/trac/gemfire/ticket/48995 for
details
geode-core/src/distributedTest/java/org/apache/geode/cache/client/internal/CacheServerSSLConnectionDUnitTest.java