WFLY-2621 Distributable @StatefulTimeout(0L) EJBs should not be immortal

https://issues.jboss.org/browse/WFLY-2621
WFLY-2590 only addressed the simple SFSB cache.  This PR completes that fix for the distributed cache.

Also, fix transient failures in clustering api tests, e.g CommandDispatcherTestCase, etc.