add ws msgid to telemetry span if it's ws requestor (#1215)

* add ws msgid to telemetry span if it's ws requestor

* wip

lib/middleware.js

@@ -438,7 +438,7 @@ module.exports = function(srf, logger) {
         span = obj.span;
         const b3 = rootSpan.getTracingPropagation();
         const httpHeaders = b3 && { b3 };
-        json = await app.requestor.request('session:new', app.call_hook, params, httpHeaders);
+        json = await app.requestor.request('session:new', app.call_hook, params, httpHeaders, span);
       }
 
       app.tasks = normalizeJambones(logger, json).map((tdata) => makeTask(logger, tdata));