replace the string with proper managed server port number

Author: sankarpn

integration-tests/src/test/java/oracle/weblogic/kubernetes/utils/IstioUtils.java

@@ -555,6 +555,7 @@ public static int createIstioService(
     templateMap.put("DUID", domainUid);
     templateMap.put("ADMIN_SERVICE",adminServerPodName);
     templateMap.put("CLUSTER_SERVICE", clusterService);
+    templateMap.put("MANAGED_SERVER_PORT", "8001");
 
     Path srcHttpFile = Paths.get(RESOURCE_DIR, "istio", "istio-http-template.yaml");
     Path targetHttpFile = assertDoesNotThrow(