Feature/metrics-timeresolution-support

Test cases for having Time series table with resolution for a minute and bug fixes to support that.

Time series table previously just writes the new data as we only tested resolution with a second, with minute aggregation , we would want to add to the previous timestamp if an entry exists and the metric type is counter, so added increment support in the time series table.

https://issues.cask.co/browse/CDAP-625
i am having separate table now, one for increments and the other for gauges, so if oldValue is non-null, it's a counter metric type. for gauge's i add them to gauges table and do a put operation on the table.