WIP HAProxy logging

[janeczku]

WIP

• Fixes rsyslog configuration parsing errors (lb-service-haproxy: Rsyslogd does not seem to be working properly. rancher#7865)
• Changes logrotate config to discard haproxy logs after 1 week
• Enables HAProxy global logging to rsyslog unix socket by default. Note, that this will only log process-level events (e.g.start-up/down, errors) but not traffic logs. If user wants traffic logs he would add a custom haproxy.cfg like this:

   lb_config:
     config: |-
       defaults
         log global
         option httplog

Todo:

• Implement logrotate periodic runs

[alena1108]

@janeczku thanks for the PR! How fast process-level evens can grow? I'm a bit concerned about growing logs in error scenarios.

[superseb]

@janeczku What is needed to get this going again?

[janeczku]

@superseb There is no cron process running in the container hence logrotate is not working at all.

[superseb]

Adding as reference rancher/rancher#7591

[alena1108]

Closing as with the release of Rancher 2.0, development on v1.6 is only limited to critical bug fixes and security patches