Remove Kafka AdminClient warn when using SSL

    <kafkaConfig name="default" topicPrefix="nuxeo-">
      <producer>
        <property name="bootstrap.servers">...</property>
        <property name="default.replication.factor">1</property>
        <property name="delivery.timeout.ms">120000</property>
        <property name="acks">1</property>
        <property name="security.protocol">SSL</property>
        <property name="ssl.truststore.type">JKS</property>
        <property name="ssl.truststore.location">/etc/.../kafka.client.truststore.jks</property>
        <property name="ssl.truststore.password">...</property>
      </producer>

2020-08-28T10:19:03,299 WARN  [main] [org.apache.kafka.clients.admin.AdminClientConfig] The configuration 'ssl.truststore.location' was supplied but isn't a known config.
2020-08-28T10:19:03,301 WARN  [main] [org.apache.kafka.clients.admin.AdminClientConfig] The configuration 'ssl.truststore.password' was supplied but isn't a known config.
2020-08-28T10:19:03,301 WARN  [main] [org.apache.kafka.clients.admin.AdminClientConfig] The configuration 'ssl.truststore.type' was supplied but isn't a known config.