Implement static component properties - passed through without modification

Change-Id: I49a2c733648f53468a398be35d1fee4518bb2a8c
diff --git a/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java b/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
index d72f64e..fa5be97 100644
--- a/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
+++ b/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp4HandlerImpl.java
@@ -123,6 +123,7 @@
 @Component(
     service = { DhcpHandler.class, HostProvider.class },
     property = {
+        "_version:Integer = 4",
         LEARN_ROUTE_FROM_LEASE_QUERY + ":Boolean=" + LEARN_ROUTE_FROM_LEASE_QUERY_DEFAULT
     }
 )