Runtime reconfiguration without killing the caches

Currently we call CacheManager.shutdown() which deregister it and the content of living caches is lost (probably because the persistence is not supported in non-re edition).

If we want to keep live caches:

1. We can't call shutdown on restart.
2. At least some of the properties should be configurable at runtime (see net.sf.ehcache.config.Configuration.DynamicProperty). The change of defaultCacheConfiguration is enough for us.
   Not sure how to change the configuration of an existing manager. We could test:

• http://ehcache.org/documentation/2.8/configuration/configuration#dynamically-changing-cache-configuration
• cacheManager = CacheManager.create(cfg);
• cacheManager.getConfiguration().setDefaultCacheConfiguration()
• ...