Hide the presence of VPN

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Hi,

I don't want people (well, more specifically, China's great firewall)
to find out that my VM has an openconnect server running.

Currently I only allow login via client certificate. I expected when
users do not present a valid client certificate, the TLS connection is
never established, so no one can find out what exactly is protected by
the TLS connection. But in reality, my ocserv responds with

```
<config-auth client="vpn" type="auth-request">
  <version who="sg">0.1(1)</version>
  <auth id="main">
    <message>Please enter your username.</message>
    <form method="post" action="/auth"> </form>
  </auth>
</config-auth>
```

which clearly tells others that it is a VPN.

Is it possible for ocserv to outright close the endpoint if client
certificates are not present or valid?

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