Add ONU and OLT device type

Change-Id: I6b53ce7c69ee810c0af931dc4122b350b9d2819c
diff --git a/core/api/src/main/java/org/onosproject/net/Device.java b/core/api/src/main/java/org/onosproject/net/Device.java
index ffbf7f9..8bcd263 100644
--- a/core/api/src/main/java/org/onosproject/net/Device.java
+++ b/core/api/src/main/java/org/onosproject/net/Device.java
@@ -27,7 +27,7 @@
      */
     enum Type {
         SWITCH, ROUTER, ROADM, OTN, ROADM_OTN, FIREWALL, BALANCER, IPS, IDS, CONTROLLER,
-        VIRTUAL, FIBER_SWITCH, MICROWAVE, OTHER
+        VIRTUAL, FIBER_SWITCH, MICROWAVE, OLT, ONU, OTHER
     }
 
     /**