agent.log should not be rotated by logrotate

[wido]

ISSUE TYPE

• Bug Report

COMPONENT NAME

cloudstack-agent
logrotate

CLOUDSTACK VERSION

4.12

OS / ENVIRONMENT

Ubuntu 16.04 / 18.04 hypervisor

SUMMARY

The /var/log/cloudstack/agent/agent.log is rotated by both log4j and logrotate and this causes the agent.log to be filled with binary (gzipped) data.

STEPS TO REPRODUCE

Try to 'grep' for some text in /var/log/cloudstack/agent/agent.log

[onitake]

Potentially related: #3443

There are still log files that are not generated by log4j.
If these are all migrated, external logrotate will no longer be necessary.

[ustcweizhou]

this has been solved by #3597

[DaanHoogland]

cherry-picked as 7e64945