Adding buck build of the meta openflow app.

Change-Id: I56f0ed3776c958680fd046295d0fbd6f18a32c56
diff --git a/BUCK b/BUCK
index 1c501a8..4862933 100644
--- a/BUCK
+++ b/BUCK
@@ -88,6 +88,7 @@
     '//providers/pcep:onos-providers-pcep-oar',
     '//providers/null:onos-providers-null-oar',
     '//providers/openflow/base:onos-providers-openflow-base-oar',
+    '//providers/openflow/app:onos-providers-openflow-app-oar',
     '//providers/rest:onos-providers-rest-oar',
     '//providers/isis:onos-providers-isis-oar',