[CORD-2882] set route source to DHCP for dhcpv6 instead of FPM

Change-Id: Icf8e4a88a73d7c957959ecb16f2b0918bcc8c809
diff --git a/apps/route-service/api/src/main/java/org/onosproject/routeservice/Route.java b/apps/route-service/api/src/main/java/org/onosproject/routeservice/Route.java
index 4b8c2a0..19407de 100644
--- a/apps/route-service/api/src/main/java/org/onosproject/routeservice/Route.java
+++ b/apps/route-service/api/src/main/java/org/onosproject/routeservice/Route.java
@@ -61,6 +61,11 @@
         STATIC,
 
         /**
+         * Route can from the DHCP route source.
+         */
+        DHCP,
+
+        /**
          * Route source was not defined.
          */
         UNDEFINED