Add DHCP relay app to buck package

Change-Id: I82eb8a6dfce92410dc45a8cac34d133c3df07897
diff --git a/tools/package/BUCK b/tools/package/BUCK
index 2fb2b8d..a34ab89 100644
--- a/tools/package/BUCK
+++ b/tools/package/BUCK
@@ -39,6 +39,7 @@
 
   # Apps
   '//apps/dhcp:onos-apps-dhcp-oar',
+  '//apps/dhcprelay:onos-apps-dhcprelay-oar',
   '//apps/fwd:onos-apps-fwd-oar',
   '//apps/acl:onos-apps-acl-oar',
   '//apps/bgprouter:onos-apps-bgprouter-oar',