Lack of EmbeddedCacheManager.undefineConfiguration(String) can cause memory/classloader leaks

EmbeddedCacheManager has defineConfiguration(...) methods for defining a new cache configuration, but has no equivalent "undefine" method. Consequently, once defined, a cache manager will retains a reference to the cache configuration object for the lifetime of the cache manager. While this is normally not a big deal, the configuration objects generated by WildFly contain references to the classloaders of foreign modules.