public Config getConfig() {
        return config;
    }
Returns the Hazelcast {@code Config} object to use to create a backing {@code HazelcastInstance} if one is not
{@link #setHazelcastInstance(com.hazelcast.core.HazelcastInstance) supplied}, or {@code null} if the
default <a href="http://www.hazelcast.com/docs/2.5/manual/multi_html/ch12.html">Hazelcast configuration
mechanisms</a> will be used.

@return the Hazelcast {@code Config} object to use to create a backing {@code HazelcastInstance} if one is not
{@link #setHazelcastInstance(com.hazelcast.core.HazelcastInstance) supplied}, or {@code null} if the
default <a href="http://www.hazelcast.com/docs/2.5/manual/multi_html/ch12.html">Hazelcast configuration
mechanisms</a> will be used.
@see Hazelcast#newHazelcastInstance(com.hazelcast.config.Config)
support/hazelcast/src/main/java/org/apache/shiro/hazelcast/cache/HazelcastCacheManager.java