Modify Autotune tests use an explicit datasource

ebean-autotune/src/test/resources/application-test.properties

@@ -1,9 +1,9 @@
 ebean.ddl.generate=true
 ebean.ddl.run=true
-#datasource.default=h2
+datasource.default=h2AutoTune
 
-datasource.db.username=sa
-datasource.db.password=
-datasource.db.url=jdbc:h2:mem:tests
+datasource.h2AutoTune.username=sa
+datasource.h2AutoTune.password=
+datasource.h2AutoTune.url=jdbc:h2:mem:tests