DB role broken for agent of version 21.9 due to log4j2 used

[v-zhuravlev]

https://github.com/CiscoDevNet/appdynamics-ansible/pull/83/checks?check_run_id=3754796295#step:7:861

DB role broken for agent of version 21.9 due to log4j2 used instead of log4j. Therefore, logger role is no longer working.

 TASK [appdynamics.agents.logger : Copy the log4j file down to update it localy] ***
  fatal: [instance]: FAILED! => {"changed": false, "msg": "file not found: /opt/appdynamics/db-agent/conf/logging/log4j.xml"}