Limit metricslogger call into statsdw for events

Histogram and counters are not in the scope of the migration into
statsd. Therefore, we can optimize the statsd socket by not propagating
histogram and counter based metricslogger calls.

Test: compiles & boots
Change-Id: I1fe277bcef438c6aceb2b674d6aec5fe0f48a270
1 file changed