ONOS-4326: Working on topology topo2start processing.
- Added getPeers() to UiTopoLayoutService.
- Fixed wipe-out command to leave the default layout alone.
- Fixed handling of null-region (associated with default layout).
- Added refresh() method to model cache.
- Fixed regions-topo-2 device IDs

Change-Id: Iee49b47ff6702bed9751be7b63392577422d4763
diff --git a/tools/test/topos/regions-topo-2 b/tools/test/topos/regions-topo-2
index 5a18c91..befed3b 100755
--- a/tools/test/topos/regions-topo-2
+++ b/tools/test/topos/regions-topo-2
@@ -41,18 +41,18 @@
 region-add r3 Region3 CAMPUS ${host}
 
 region-add-devices r1 \
-    of:0000000000000002 \
-    of:0000000000000003 \
-    of:0000000000000004
+    null:0000000000000002 \
+    null:0000000000000003 \
+    null:0000000000000004
 
 region-add-devices r2 \
-    of:0000000000000005 \
-    of:0000000000000006
+    null:0000000000000005 \
+    null:0000000000000006
 
 region-add-devices r3 \
-    of:0000000000000007 \
-    of:0000000000000008 \
-    of:0000000000000009
+    null:0000000000000007 \
+    null:0000000000000008 \
+    null:0000000000000009
 
 regions