test fixes:tests run in parallel, use unique port for grpc server per test

Author: Alexander Furer

grpc-spring-boot-starter-demo/src/test/java/org/lognet/springboot/grpc/OrderedInterceptorsTest.java

@@ -32,15 +32,15 @@
  */
 @RunWith(SpringRunner.class)
 @SpringBootTest(classes = {DemoApp.class, TheConfiguration.class},
-    webEnvironment = WebEnvironment.NONE, properties = "grpc.port=7777")
+    webEnvironment = WebEnvironment.NONE, properties = "grpc.port=7778")
 public class OrderedInterceptorsTest {
 
   private ManagedChannel channel;
   private static List<Integer> calledInterceptors = new ArrayList<>();
 
   @Before
   public void setup() {
-    channel = ManagedChannelBuilder.forAddress("localhost", 7777)
+    channel = ManagedChannelBuilder.forAddress("localhost", 7778)
         .usePlaintext(true)
         .build();
     calledInterceptors.clear();