[EJBCLIENT-324] Fix Phantom NoSuchEJBExceptions and retry mechanism

[rachmatowicz]

This PR addresses the issue described in: https://issues.jboss.org/browse/EJBCLIENT-324

[rachmatowicz]

This test causes one test in EAP clustering testsuite to fail:

[INFO] Running org.jboss.as.test.clustering.cluster.ejb2.stateless.RemoteStatelessFailoverTestCase
[ERROR] Tests run: 6, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 108.076 s <<< FAILURE! - in org.jboss.as.test.clustering.cluster.ejb2.stateless.RemoteStatelessFailoverTestCase
[ERROR] testFailoverOnUndeployAnnotatedBean(org.jboss.as.test.clustering.cluster.ejb2.stateless.RemoteStatelessFailoverTestCase) Time elapsed: 11.461 s <<< ERROR!
javax.ejb.NoSuchEJBException: EJBCLIENT000079: Unable to discover destination for request for EJB StatelessEJBLocator for "/RemoteStatelessFailoverTestCase/StatelessBean", view is interface org.jboss.as.test.clustering.cluster.ejb2.stateless.bean.StatelessRemoteHome, affinity is Cluster "ejb"
at org.jboss.ejb.client.EJBClientInvocationContext.getResult(EJBClientInvocationContext.java:607)

However, when running the failing test in isolation, it passes. It looks as though the DNR is being contaminated from a previous test, so that the test starts out with a non-empty DNR, which is incorrect. Will investigate.