Optimize csv report for service metrics

[sonyafenge]

Current report display all service metrics:

I0729 23:02:01.662264    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 109.456474ms | perc90 158.186015ms | perc99 195.472596ms. Total count 92
-- | -- | --
I0729 23:07:01.663100    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 85.413403ms | perc90 152.186642ms | perc99 190.655053ms. Total count 216
I0729 23:12:01.664288    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 99.785451ms | perc90 157.373785ms | perc99 187.332663ms. Total count 347
I0729 23:17:01.665047    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 104.846584ms | perc90 159.324031ms | perc99 185.791892ms. Total count 465
I0729 23:22:01.666167    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 99.269074ms | perc90 164.123061ms | perc99 185.03227ms. Total count 613
I0729 23:27:01.666692    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 103.795279ms | perc90 167.080959ms | perc99 187.332663ms. Total count 747
I0729 23:32:01.667735    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 103.572061ms | perc90 166.7613ms | perc99 187.332663ms. Total count 770

expected only last metrics for service and table format

I0729 23:32:01.667735    2256 event_metrics.go:105] [Metrics][AGG_RECEIVED] perc50 103.572061ms | perc90 166.7613ms | perc99 187.332663ms. Total count 770
-- | -- | --

[sonyafenge]

fixed with PR: #136