title: How to set redis "session key prefix" using RedissonSessionManager
body: <p>I want to use "redisson-tomcat" library to store tomcat session in redis. But I need to add key prefix before storing sessions in redis. Is there any way to add session key prefix when storing sessions in redis ? As per my finding I need to configure "RedissonSessionManager" with tomcat. like bellow</p>
  
  <p><code>&lt;Manager className="org.redisson.tomcat.RedissonSessionManager"
            configPath="${catalina.base}/redisson.conf" readMode="MEMORY" updateMode="DEFAULT"/&gt;</code></p>
  
  <p>it looks like lot of thinks can be configured using "redisson.conf" file but, I don't see any configuration to add key prefix.</p>
  
  <p>Can anyone help me on this ?</p>