ServiceName to String roundtrip issue

While working on JBAS-8542 I noticed that String may be a poor representation of a ServiceName.

Consider

ServiceName.JBOSS.append("osgi", "framework");

which is a pattern that we find everywhere in the AS codebase.

ServiceName.parse("jboss.osgi.framework") would construct a ServiceName that is equivalent to
ServiceName.JBOSS.append("osgi").append("framework"), which is not equal what I used above.

Hence

ServiceContainer.getService(ServiceName.parse("jboss.osgi.framework"))

fails if the framework service was not constructed with ServiceName.JBOSS.append("osgi").append("framework")