Statsdcc <-> Statsdcc Compatibility Enhancements

[rrusso1982]

These enhancements are designed to improve the "drop-in" replacement compatibility of statsdcc with statsd. A general overview of the changes are:

• Metrics prefix: The ability to add a prefix to all metrics that are processed by the statsdcc instance. Ex: metricA.count -> prefix.metricsA.count
• Metrics grouping: All metrics that go through statsdcc should be grouped by metrics type. These are counters, timers, gauges, and sets. Hence instead of producing the counter "metricA.count" it will produce "counters.metricA.count"
• Timer percentiles: Statsdcc does support percentile calculations for timers however it does not produce the same set that statsd produces. By default it will produce upper_X for each percentile but for more compatibility with statsd it also needs to produce count_X, sum_X, and mean_X.

[sdomalap]

This looks good. We will likely make a few changes in order to put some if this new functionality behind parameters (i.e. Optional).