[WFLY-3667] Remove EJB default permissions concept

As per https://issues.jboss.org/browse/WFLY-3667 I think introducing these permissions was an error and is never desirable in a security manager situation.  This PR removes the permissions and makes the corresponding enable/disable attribute a no-operation.
I can't help thinking it would be nicer to introduce a utility to generate this XML, rather than embedding these XML snippets into the test classes.