INF-38528 - updated ScheduledReporter to allow passing in our own ScheduledExecutorService to use. also updated MetricRegistry to be a bit more flexible with the way names of counters, histograms, meters, and timers are passed in.

INF-38528 - updated ScheduledReporter to allow passing in our own ScheduledExecutorService to use. also updated MetricRegistry to be a bit more flexible with the way names of counters, histograms, meters, and timers are passed in.