DefaultExecutorService throws ISE if constructed with ManagedExecutorService

ManagedExecutorService.isShutdown() always throws an IllegalStateException per section 3.1.6.1 "Java EE Product Provider Requirements" of the JEE concurrency specification.
However, the DefaultCacheManager constructor always calls the isShutdown() method of the delegate ExecutorService. This prevents DefaultExecutorService from being constructed with a ManagedExecutorService.