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[scheduled tasks] Improve scheduled task logging

[scheduled tasks] Improve scheduled task logging

With "System Log" available scheduled tasks now can log more info about what they are doing:

Scheduled Task NameWhat Can Be WrittenLog Level
check_submission_repieshow much replies where processed in each runInfo
check_bounced_submission_repieshow much bounced replies where processed in each runInfo
clean_catalog_imageshow much images were deleted and total freed disk amountInfo
clean_resized_catalog_imageshow much images were deleted and total freed disk amountInfo
rotate_email_logshow much logged e-mails were deletedDebug
generate_mailing_queuehow much e-mails were queued (from mailing list processing)Debug
membership_expirationhow much user memberships were expired (user count for each group)Info
delete_expired_sessionshow much expired sessions were deleted (vs sessions still active)Debug
process_email_queuehow much e-mails were sent out from a queueInfo

No info should be written in case, when no data was processed by a scheduled task.