RFR: update-sync labels should be applied to all-bar-one records

[Rob McKenna]

On Fri, 25 Sep 2020 14:26:18 GMT, Rob McKenna <robm at openjdk.org> wrote:

> This modification fixes the situation where a backport record may be a member
> of two distinct streams and has its hgupdate-sync label removed as a result.
> 
> E.g. with backport records for 14, 15, 14.0.1, 15.0.1 no label would be
> applied to 15. The current logic gives precedence to the fact that it is the
> first release in the 15-updates stream and ignores the fact that it is not
> the first release in the feature stream. The label added by the feature stream
> is removed when evaluating the 15-updates stream. This should not be the case.

@kevinrushforth - it'd be great if you could take a look at this when you're able.

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PR: https://git.openjdk.java.net/skara/pull/848