Fixing tree topology simulator to chose proper edge-ports for host attachment.

Change-Id: I9ab9a26dbe1491068e61df611edb6e41302afa5b
diff --git a/providers/null/src/main/java/org/onosproject/provider/nil/TreeTopologySimulator.java b/providers/null/src/main/java/org/onosproject/provider/nil/TreeTopologySimulator.java
index dad390a..98dd210 100644
--- a/providers/null/src/main/java/org/onosproject/provider/nil/TreeTopologySimulator.java
+++ b/providers/null/src/main/java/org/onosproject/provider/nil/TreeTopologySimulator.java
@@ -55,7 +55,6 @@
 
     @Override
     protected void createLinks() {
-
         int portOffset = 1;
         for (int t = 1; t < tierOffset.length; t++) {
             int child = tierOffset[t];
@@ -72,7 +71,7 @@
     @Override
     protected void createHosts() {
         for (int i = tierOffset[tierOffset.length - 1]; i < deviceCount; i++) {
-            createHosts(deviceIds.get(i), hostCount);
+            createHosts(deviceIds.get(i), 2);
         }
     }
 }