Simple ip4 NAT plugin

Change-Id: Iffe77bf2a05ced41474540ff54a842101aad7c41
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/build-data/platforms/vpp.mk b/build-data/platforms/vpp.mk
index 9026ad3..45f74d3 100644
--- a/build-data/platforms/vpp.mk
+++ b/build-data/platforms/vpp.mk
@@ -38,6 +38,10 @@
 # Set these parameters carefully. The vlib_buffer_t is 128 bytes, i.e.
 vlib_configure_args_vpp = --with-pre-data=128
 
+# Enable plugins here, and no place else, via multiple --enable-XXX-plugin
+# stanzas.
+plugins_configure_args_vpp = --with-dpdk --enable-sixrd-plugin 
+
 # DPDK configuration parameters
 # vpp_uses_external_dpdk = yes
 # vpp_dpdk_inc_dir = /usr/include/dpdk