Use default value for automatically rebalancing masters on upgrade

Change-Id: Ib1f4867ab79aa112234ff220bd8eb8d282e1aaae
diff --git a/core/net/src/main/java/org/onosproject/cluster/impl/MastershipManager.java b/core/net/src/main/java/org/onosproject/cluster/impl/MastershipManager.java
index 8987542..1a4fc5f 100644
--- a/core/net/src/main/java/org/onosproject/cluster/impl/MastershipManager.java
+++ b/core/net/src/main/java/org/onosproject/cluster/impl/MastershipManager.java
@@ -123,7 +123,7 @@
     @Property(name = "rebalanceRolesOnUpgrade",
             boolValue = DEFAULT_REBALANCE_ROLES_ON_UPGRADE,
             label = "Automatically rebalance roles following an upgrade")
-    protected boolean rebalanceRolesOnUpgrade;
+    protected boolean rebalanceRolesOnUpgrade = DEFAULT_REBALANCE_ROLES_ON_UPGRADE;
 
     @Activate
     public void activate() {