RFR (S) 8225046: Shenandoah metrics logs refactoring

[Roman Kennke]

> RFE:
>  https://bugs.openjdk.java.net/browse/JDK-8225046
> 
> Shenandoah uses internal metrics to gauge progress in degenerated and full GC. The logging there can
> be refactored a bit: it should clearly show the progress decisions made. Also, there is a bug in
> displaying the external fragmentation.
> 
> Fix:
>   http://cr.openjdk.java.net/~shade/8225046/webrev.01/
> 
> Testing: hotspot_gc_shenandoah
> 

Looks good to me.

Thanks,
Roman

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