#4399 [HHQ-4293] Add more sampling capability for hqstat metrics

[Hyperic Team]

http://jira.hyperic.com/browse/HHQ-4293
Currently the hqstats mechanism samples data every 15 seconds. This is fine for many metrics that consistently report in numbers during this interval, but for metrics where the state is captured once every 15 second interval this could be a problem since we will miss the potential highs and lows for the interval.

For certain metrics like JDBC connection in use, it should sample once a second and report the maximum value for the 15 second interval to be appended to the stats file.

Other metrics we may want further enhance mechanism were a metric would sample its data every second and record the _MIN, _MAX, and _AVG for the sampling period in the file.

This would give us much better insight into the inner workings of the application at runtime.