Update the module example test manifest

This change provides a clear indication about how relationships
are expected to be managed when the end user consumes the module.

tests/init.pp

@@ -1 +1,10 @@
-include java
+node default {
+
+  notify { "alpha": } ->
+  class { 'java':
+    distribution => 'jdk',
+    version      => 'latest',
+  } ->
+  notify { "omega": }
+
+}