Adding BUILD files for Kafka integration app; still WIP though.

Change-Id: I9e33eede17eddbd22cda7e188576c802d1be0ed4
diff --git a/modules.bzl b/modules.bzl
index b0deb36..4ced3f0 100644
--- a/modules.bzl
+++ b/modules.bzl
@@ -294,7 +294,7 @@
     "//apps/vtn/vtnmgr:onos-apps-vtn-vtnmgr",
     "//apps/vtn/vtnweb:onos-apps-vtn-vtnweb",
     #   '//apps/p4runtime-test:onos-apps-p4runtime-test',
-    #"//apps/kafka-integration/api:onos-apps-kafka-integration-api",
+    "//apps/kafka-integration/api:onos-apps-kafka-integration-api",
     #"//apps/kafka-integration/app:onos-apps-kafka-integration-app",
 ]