Add metric filtering support for the JVM metrics

Fix metric name filtering so it can handle the JVM metrics.

```
14/12/12 19:36:31 ERROR Statsd: Error sending to Statsd:
java.lang.IllegalArgumentException: Unrecognized metric name pattern: spark.app-20141212193256-0012.15.jvm.total.max
    at com.bealetech.metrics.reporting.Statsd.buildMetricName(Statsd.java:86)
```

@airhorns @angelini @orenmazor