Util class tries to locate resource bundles using TCCL, which fails

This causes JPA applications with 2LC backed by org.hibernate.cache.infinispan.InfinispanRegionFactory to not work. Applications using org.jboss.as.jpa.hibernate5.infinispan.InfinispanRegionFactory seem to work.

org.jgroups.util.Util class tries to locate jg-messages bundle using the TCCL, not its own class loader. In a Java SE environment, this typically doesn't matter, because the class loaders are the same, but in EAP, this means that jg-messages is sought by the class loader of the application rather than the class loader of JGroups module, which is obviously wrong. This is the offending line: https://github.com/belaban/JGroups/blob/74d3da4f6b04e941b3751e6ac97ed154718fb583/src/org/jgroups/util/Util.java#L104

The call to getBundle fails with a MissingResourceException (see http://docs.oracle.com/javase/6/docs/api/java/util/ResourceBundle.html#getBundle%28java.lang.String,%20java.util.Locale,%20java.lang.ClassLoader%29) and because this code is in a static initializer, the Util class becomes unusable.