- fixed issue on diff contextPath during running and testing, updated from "/hapi-fhir-jpaserver" to "/" and hapi.properties configs on server_address and server.base works out of the box with jetty

- replicated testWebsocketSubscription test from ExampleServerR4IT into ExampleServerDstu3IT

src/test/java/ca/uhn/fhir/jpa/starter/ExampleServerR4IT.java

@@ -64,7 +64,6 @@ public class ExampleServerR4IT {
         assertEquals(methodName, pt2.getName().get(0).getFamily());
     }
 
-
     @Test
     public void testWebsocketSubscription() throws Exception {
         /*
@@ -123,7 +122,6 @@ public class ExampleServerR4IT {
         ourClient.delete().resourceById(mySubscriptionId).execute();
     }
 
-
     @AfterClass
     public static void afterClass() throws Exception {
         ourServer.stop();