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/kafka/kafka_pub/glide.lock

@@ -0,0 +1,26 @@
+hash: 1c2fb68841e4a62048d54923d75952578dc4812d9a5c060b031e7c4d47c4e97e
+updated: 2018-10-19T14:57:56.260957841+05:30
+imports:
+- name: github.com/davecgh/go-spew
+  version: 8991bc29aa16c548c550c7ff78260e27b9ab7c73
+  subpackages:
+  - spew
+- name: github.com/eapache/go-resiliency
+  version: ea41b0fad31007accc7f806884dcdf3da98b79ce
+  subpackages:
+  - breaker
+- name: github.com/eapache/go-xerial-snappy
+  version: 040cc1a32f578808623071247fdbd5cc43f37f5f
+- name: github.com/eapache/queue
+  version: 093482f3f8ce946c05bcba64badd2c82369e084d
+- name: github.com/golang/snappy
+  version: 2e65f85255dbc3072edf28d6b5b8efc472979f5a
+- name: github.com/pierrec/lz4
+  version: 6b9367c9ff401dbc54fabce3fb8d972e799b702d
+  subpackages:
+  - internal/xxh32
+- name: github.com/rcrowley/go-metrics
+  version: e2704e165165ec55d062f5919b4b29494e9fa790
+- name: github.com/Shopify/sarama
+  version: a6144ae922fd99dd0ea5046c8137acfb7fab0914
+testImports: []

test/tests/mqtrigger/kafka/kafka_pub/glide.yaml

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+import:
+- package: github.com/Shopify/sarama

test/tests/mqtrigger/kafka/kafka_pub/kafka-pub.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+
+	sarama "github.com/Shopify/sarama"
+)
+
+// Handler posts a message to Kafka Topic
+func Handler(w http.ResponseWriter, r *http.Request) {
+	brokers := []string{"broker.kafka.svc.cluster.local:9092"}
+	producerConfig := sarama.NewConfig()
+	producerConfig.Producer.RequiredAcks = sarama.WaitForAll
+	producerConfig.Producer.Retry.Max = 10
+	producerConfig.Producer.Return.Successes = true
+	producer, err := sarama.NewSyncProducer(brokers, producerConfig)
+	fmt.Println("Created a new producer ", producer)
+	if err != nil {
+		panic(err)
+	}
+	_, _, err = producer.SendMessage(&sarama.ProducerMessage{
+		Topic: "testtopic",
+		Value: sarama.StringEncoder("{\"name\": \"testvalue\"}"),
+	})
+
+	if err != nil {
+		w.Write([]byte(fmt.Sprintf("Failed to publish message to topic %s: %v", "testtopic", err)))
+		return
+	}
+	w.Write([]byte("Successfully sent to testtopic"))
+}