Restore validation of JMS resource manager factory passivation

This test was effectively disabled without explanation by this commit:
https://github.com/wildfly/wildfly/commit/26b0c6cf254da7adbe913195e65abb2f02245a16#diff-12

Other cosmetic clustering testsuite changes:
* Rename distribution target directories from "jbossas-clustering" to "wildfly"
* Rename "clust" (whatever that is) to "clustering"