code: function setRequestId(id, cb) {
    var ns = getLoggerNamespace();
    ns.run(function() {
      ns.set('requestId', id);
      cb();
    });
  }
docs: Request Id setter, intended to be used by setup for unit testing
  Normal usage should involve the express middleware in {@link ./middleware.js}
  @param {String} id Request Id value
  @param {Function} cb Callback to run with the requestId set