Use recordResponseTimeMetric instead recordMetric in NewRelic agent.

[Matzz]

It seams that

    public static void recordResponseTimeMetric(String name, long millis) {
        getAgent().getMetricAggregator().recordMetric(name, millis);
    }

recordResponseTimeMetric calls recordMetric in MetricAggregator instead of recordResponseTimeMetric.

[CLAassistant]

All committers have signed the CLA.

[Matzz]

@jtduffy I just started to wonder if I introduced backward compatibility break here.
As far as I understand when we call MetricAggregator.recordResponseTimeMetric the values are converted from millis to seconds. Is that the same case for recordMetric? What is the difference between recordMetric and recordResponseTimeMetric?
Does changing recordMetric to recordResponseTimeMetric could break some existing charts?