title: ee key too small when doing connect in paho mqtt (client certificat)
body: <p>I am using paho mqtt to send message with python3 on ubuntu 20.04.
  I am using ssl version 2</p>
  <p>When i do :</p>
  <pre><code>client = mqtt.Client()
  client.tls_set(ca_certs=CA_CERT, certfile=CLIENT_CERT, keyfile=CLIENT_KEY)
  client.connect(HOST, 8883, 20)
  </code></pre>
  <p>I am getting this error:</p>
  <pre><code>     File &quot;/usr/local/lib/python3.8/dist-packages/paho/mqtt/client.py&quot;, line 823, in tls_set
    context.load_cert_chain(certfile, keyfile)
  ssl.SSLError: [SSL: EE_KEY_TOO_SMALL] ee key too small (_ssl.c:4046)
  </code></pre>
  <p>My  private key is 1024 bits
  I can not change my client certificat.</p>
  <p>Any workaround please ?</p>