Layout and Region configs.
- Listen for topo-layout config changes.
- Augmenting UiTopoLayout to include fields for geomap/sprite, scale/offset

Change-Id: I2b1f747f41d39b64b0a1a53946c4cbd5750db9e5
diff --git a/core/api/src/main/java/org/onosproject/ui/UiTopoLayoutService.java b/core/api/src/main/java/org/onosproject/ui/UiTopoLayoutService.java
index 3a42dac..8872087 100644
--- a/core/api/src/main/java/org/onosproject/ui/UiTopoLayoutService.java
+++ b/core/api/src/main/java/org/onosproject/ui/UiTopoLayoutService.java
@@ -37,7 +37,7 @@
     UiTopoLayout getRootLayout();
 
     /**
-     * Returns the set of available layouts.
+     * Returns the set of available layouts (not including the root layout).
      *
      * @return set of available layouts
      */