title: One client certificate per user in Gatling scenario?
body: <p>I am trying to define a Gatling scenario using a different client certificate per user.
  I am using Gatling 3.7.1. The hints (e.g. this one <a href="https://stackoverflow.com/questions/65086692/how-to-setup-gatling-to-use-client-certificates-per-virtual-user">How to setup Gatling to use client certificates per virtual user?</a>) I found do not work anymore with the new Gatling versions. The Ssl class does not exist anymore since Gatling 3.4</p>
  <p>Gatling documentation states to use:</p>
  <pre><code>http.perUserKeyManagerFactory(userId =&gt; null.asInstanceOf[javax.net.ssl.KeyManagerFactory])
  </code></pre>
  <p>However, I have no glue how I can inject the user dependent key store?
  I tried to set the properties gatling.ssl.keyStore.file and the related password property in the session context but that did not work.</p>