Add /var/log/syslog to time based rotation as well

/var/log/syslog was initially added to size based rotaion plan (20-fuel.conf) only.
Should be added to time based rotation plan (10-fuel.conf) as well.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>
Fix verbose/debug logic for cluster_*

debug == verbose == false is normal case
(syslog_log_level would be used then to filter messages by its level)

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>