title: mongodb query router setup issue with config file
body: <p>I am using mongodb v3.2.8 and setting up a query router for a mongo shard. I am using the following syntax inside the config file being used by the query router to specify the config servers (already running):</p>
  
  <pre><code>sharding:
     configDB: xxx.xxx.xxx.xxxx:27019,xxx.xxx.xxx.xxx:27020
  </code></pre>
  
  <p>However, when I try to run the query router using this config file, I am getting the following error:</p>
  
  <pre><code>BadValue: Invalid configdb connection string: FailedToParse: invalid url [127.0.0.1:27019,127.0.0.1:27020]
  </code></pre>
  
  <p>Can anyone point to the correct syntax for specifying a list of config servers inside the config file being used to start the query routers?</p>