fix(instrumentations/http/server): read communication id

Author: dszakallas

lib/instrumentations/core/http/server.js

@@ -64,12 +64,14 @@ function httpServer (listener, agent) {
 
     var parentServiceKey = headers['x-parent'] && Number(headers['x-parent'])
     var timestamp = headers['x-client-send'] && Number(headers['x-client-send'])
+    var communicationId = headers['x-span-id']
 
     var duffelBag = {
       severity: severity,
       transactionId: requestId,
       parentServiceKey: parentServiceKey,
-      timestamp: timestamp
+      timestamp: timestamp,
+      communicationId: communicationId
     }
 
     var resource = util.formatDataUrl(requestUrl)

lib/instrumentations/core/http/server.spec.js

@@ -174,7 +174,8 @@ describe('The http.Server.prototype wrapper module', function () {
       parentServiceKey: 1,
       severity: 3,
       timestamp: 5,
-      transactionId: 'tr-id'
+      transactionId: 'tr-id',
+      communicationId: 'comm-id'
     })
   })