Kafka tests (#944)

A simple test for Kafka integration which runs locally provided cluster has Kafka and Fission install has Kafka integratiom enabled (mqtrigger-kafka deployment present).

test/tests/mqtrigger/nats/main_error.js

@@ -0,0 +1,6 @@
+module.exports = async function(context) {
+    return {
+        status: 400,
+        body: "Hello, World!"
+    };
+}