Optimize Kafka SSL integration test

- ERs sometimes took too long to receive a message.
  Setting kafkaGroupID to "" prevents this.
- Kafka reader took 10s to close (default MaxWait).
  Set MaxWait to 1ms.
- Exporters took 1s each to export due to BatchSize
  not being hit. Set BatchSize to 1 to prevent it.

general_tests/kafka_ssl_it_test.go

@@ -72,6 +72,7 @@ func TestKafkaSSL(t *testing.T) {
 			"synchronous": true,
             "opts": {
                 "kafkaTopic": "%s",
+				"kafkaBatchSize": 1,
                 "kafkaTLS": true,
                 "kafkaCAPath": "/tmp/ssl/kafka/ca.crt",
                 "kafkaSkipTLSVerify": false
@@ -84,8 +85,9 @@ func TestKafkaSSL(t *testing.T) {
             "export_path": "%s",
 			"synchronous": true,			
             "opts": {
-                "kafkaTopic": "%s"
-            },												
+                "kafkaTopic": "%s",
+				"kafkaBatchSize": 1
+			},												
             "failed_posts_dir": "*none"
         }
     ]
@@ -104,8 +106,9 @@ func TestKafkaSSL(t *testing.T) {
             "source_path": "%s",			
             "ees_success_ids": ["kafka_processed"],	
             "opts": {
-                "kafkaTopic": "%s",						
-                "kafkaTLS": true,				
+				"kafkaTopic": "%s",
+				"kafkaGroupID": "",
+                "kafkaTLS": true,
                 "kafkaCAPath": "/tmp/ssl/kafka/ca.crt",
                 "kafkaSkipTLSVerify": false
             },
@@ -167,23 +170,38 @@ func TestKafkaSSL(t *testing.T) {
 		r := kafka.NewReader(kafka.ReaderConfig{
 			Brokers: []string{brokerPlainURL},
 			Topic:   "processed",
+			MaxWait: time.Millisecond,
 		})
-
 		t.Cleanup(func() {
 			if err := r.Close(); err != nil {
 				t.Error("failed to close reader:", err)
 			}
 		})
 
-		m, err := r.ReadMessage(context.Background())
-		if err != nil {
-			t.Fatalf("kafka.Reader.ReadMessage() failed unexpectedly: %v", err)
-		}
-
-		got := string(m.Value)
 		want := `{"Account":"1001","Destination":"1002","OriginID":"abcdef","ToR":"*voice","Usage":"10000000000"}`
-		if got != want {
-			t.Errorf("kafka.Reader.ReadMessage() = %v, want %v", got, want)
+
+		readErr := make(chan error)
+		msg := make(chan string)
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+		go func() {
+			m, err := r.FetchMessage(ctx)
+			if err != nil {
+				readErr <- err
+				return
+			}
+			msg <- string(m.Value)
+		}()
+
+		select {
+		case err := <-readErr:
+			t.Errorf("kafka.Reader.ReadMessage() failed unexpectedly: %v", err)
+		case got := <-msg:
+			if got != want {
+				t.Errorf("kafka.Reader.ReadMessage() = %v, want %v", got, want)
+			}
+		case <-time.After(2 * time.Second):
+			t.Errorf("kafka.Reader.ReadMessage() took too long (>%s)", 2*time.Second)
 		}
 	})
 }