SmallRye Metrics - JmxWorker - findKeyForValueToBeReplaced could use some polish

https://github.com/smallrye/smallrye-metrics/blob/master/implementation/src/main/java/io/smallrye/metrics/JmxWorker.java#L156

• iterate entrySet instead of keySet
• can it happen that there are more entries with value '*' ?
• shouldn't the for cycle end when the (first?) match is found ?