Fix generation of events for StatusLogger

[alexott]

In current version, events from StatusLogger are generated without date field, and without properly filled product/category/type...

{'header': 'Pool', 'delayed_header': 'Delayed     ', 'event_product': 'unknown', 'event_category': 'unknown', 'event_type': 'unknown'}
{'pool_name': 'AuthzStage', 'active': '0', 'pending': '0', 'backpressure': None, 'delayed': None, 'completed': '0', 'blocked': '0', 'all_time_blocked': '0', 'event_product': 'unknown', 'event_category': 'unknown', 'event_type': 'unknown'}
{'pool_name': 'LwtStage', 'active': '0', 'pending': '0', 'backpressure': None, 'delayed': None, 'completed': '0', 'blocked': '0', 'all_time_blocked': '0', 'event_product': 'unknown', 'event_category': 'unknown', 'event_type': 'unknown'}

so this lead to errors during processing, like, #1