DHCP client - remove interface address when DHCP de-configured

Change-Id: I63c59e3c13859b51999d283774f7783ef0a6a5ed
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/dhcp/client.c b/src/vnet/dhcp/client.c
index 014f17a..8f033d2 100644
--- a/src/vnet/dhcp/client.c
+++ b/src/vnet/dhcp/client.c
@@ -821,6 +821,7 @@
 				      1,
 				      FIB_ROUTE_PATH_FLAG_NONE);
       }
+      dhcp_client_release_address (dcm, c);
       ip4_sw_interface_enable_disable (c->sw_if_index, 0);
 
       vec_free (c->option_55_data);