Add nodejs to crossdock tests (#261)

- Also adds missing comment for java

Signed-off-by: Bhavin Gandhi <bhavin7392@gmail.com>

crossdock/docker-compose.yml

@@ -8,19 +8,20 @@ services:
             - go
             - python
             - java
+            - nodejs
         environment:
-            - WAIT_FOR=test_driver,go,python,java
+            - WAIT_FOR=test_driver,go,python,java,nodejs
             - WAIT_FOR_TIMEOUT=60s
 
             - CALL_TIMEOUT=60s
 
             - AXIS_CLIENT=go
 
-            - AXIS_S1NAME=go,python,java
+            - AXIS_S1NAME=go,python,java,nodejs
             - AXIS_SAMPLED=true,false
-            - AXIS_S2NAME=go,python,java
+            - AXIS_S2NAME=go,python,java,nodejs
             - AXIS_S2TRANSPORT=http
-            - AXIS_S3NAME=go,python,java
+            - AXIS_S3NAME=go,python,java,nodejs
             - AXIS_S3TRANSPORT=http
 
             - BEHAVIOR_TRACE=client,s1name,sampled,s2name,s2transport,s3name,s3transport
@@ -43,10 +44,18 @@ services:
         links:
             - "jaeger:jaeger-agent"
         depends_on:
+            # Udp sender needs to know agent's address
             - jaeger
         ports:
             - "8080-8082"
 
+    nodejs:
+        image: jaegertracing/xdock-node
+        links:
+            - "jaeger:jaeger-agent"
+        ports:
+            - "8080-8082"
+
     python:
         build:
             context: ../.