zebra: add the link interface information on interface updates

There are cases where either link information is not present at
interface creation or link information changed. handle this
situation.

Signed-off-by: Philippe.Guibert <philippe.guibert@6wind.com>

zebra dd link

zebra/if_netlink.c

@@ -1550,6 +1550,9 @@ int netlink_link_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
 
 			memcpy(old_hw_addr, ifp->hw_addr, INTERFACE_HWADDR_MAX);
 
+			/* Update link. */
+			zebra_if_update_link(ifp, link_ifindex, ns_id);
+
 			netlink_interface_update_hw_addr(tb, ifp);
 
 			if (if_is_no_ptm_operative(ifp)) {