ONOS-6563 ONOS-6866 Draft porting of old ECMP P4 demo application

Also, pipeconf implementation for ecmp.p4

Change-Id: Ia8973b42ae386482e341c2b201ad887ad471091e
diff --git a/modules.defs b/modules.defs
index c9aa174..22920c5 100644
--- a/modules.defs
+++ b/modules.defs
@@ -210,6 +210,7 @@
     '//apps/l3vpn:onos-apps-l3vpn-oar',
     '//apps/openroadm:onos-apps-openroadm-oar',
     '//apps/artemis:onos-apps-artemis-oar',
+    '//apps/pi-demo/ecmp:onos-apps-pi-demo-ecmp-oar',
     '//apps/gluon:onos-apps-gluon-oar',
     '//apps/evpnopenflow:onos-apps-evpnopenflow-oar',
     '//apps/route-service:onos-apps-route-service-oar',