Statsd Anomaly tracking for CountMetricProducer

CountMetricProducer now has a CountAnomalyTracker which stores past
bucket information. Anomalies can be determined by seeing if the
information from the past and current buckets exeeds a threshold.

Test: manual
Change-Id: I35103c01dd32dcc31cb155f5685161cbaf969d03
5 files changed