Support for configurable fractional percentile metrics in output file...

[jschmieg]

I added support for Double values in percentile metrics. Configuration is not changed: values are defined in hdrhistogram.percentiles, but with this modification, it accepts Double values.

[risdenk]

@jschmieg is this a duplicate of PR #862?

[jschmieg]

Yes,it is. I requested it again to see Travis build status, which failed at first time.

[risdenk]

ok just closed #862. We can focus on this PR. I can take a look at the failing travis ci tests.

[risdenk]

@jschmieg Does this change the output format for integers? If you put in say 95 will it output 95.0?

[jschmieg]

Hi @risdenk ,
it doesn't change format of integers. They still look like this:
[INSERT], 95thPercentileLatency(us), 700.0
For double values output is like this:
[INSERT], 99.9PercentileLatency(us), 18415.0

[risdenk]

Thanks @jschmieg