Provide an API that allows adding of URLStreamHandlerFactories

The OSGi integration layer currently contains this hack

// TODO: Hack, which registers the framework module with the

String value = SystemPropertyActions.getProperty("jboss.protocol.handler.modules", "org.jboss.osgi.framework");
if (!value.equals("org.jboss.osgi.framework"))
value = value + "|org.jboss.osgi.framework";
System.setProperty("jboss.protocol.handler.modules", value);