private static void closeClientCacheTask() {
    if (instance != null && instance.clientCache != null) {
      instance.clientCache.close();
    }
  }
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