Fixing the access network null simulation and adjusting layout.

Change-Id: Ib6f0c100789b1f802269018d36aed8d06ce4e5d4
diff --git a/apps/layout/src/main/java/org/onosproject/layout/AccessNetworkLayout.java b/apps/layout/src/main/java/org/onosproject/layout/AccessNetworkLayout.java
index 9f4f39d..8f3d02f 100644
--- a/apps/layout/src/main/java/org/onosproject/layout/AccessNetworkLayout.java
+++ b/apps/layout/src/main/java/org/onosproject/layout/AccessNetworkLayout.java
@@ -43,7 +43,7 @@
     private double accessY = +400.0;
     private double hostsY = +550.0;
 
-    private double gatewayX = 900.0;
+    private double gatewayX = 1500.0;
     private double rowGap = 70;
     private double computeRowGap = -120;
     private double colGap = 54;