After update Mac OS Sierra, Can not use ssh login remote system,how can I fix this? : <p>when I use <code>user@ip</code> to login remote system, it report like this:</p>

<pre><code>debug1: /etc/ssh/ssh_config line 17: Applying options for *
/etc/ssh/ssh_config: line 20: Bad configuration option: gssapikeyexchange
/etc/ssh/ssh_config: line 21: Bad configuration option: gssapitrustdns
/etc/ssh/ssh_config: terminating, 2 bad configuration options
</code></pre>
