jboss-html5-mobile-archetype should use a different persistence.xml for tests

jboss-html5-mobile-archetype generates a project with a persistence.xml file under src/test/resources/META-INF. Since eclipse doesn't disambiguates test and main classpaths, this leads to some issues in hibernate tools (JBDS-2452)

The generated project should use a test-persistence.xml, consistent with the kitchensink and javaee archetypes, something used in the tests as

.addAsResource("META-INF/test-persistence.xml", "META-INF/persistence.xml")