RFR: 7243: Resolve discrepancy between JDK attributes coming from different JDK versions

[Marcus Hirt]

On Wed, 13 Jul 2022 15:22:54 GMT, Suchita Chaturvedi <schaturvedi at openjdk.org> wrote:

> This PR resolves the issue of thread attribute discrepancy between different JDK versions.
> 
> The issue had two parts - first one was already resolved as part of another bug, second part will be fixed as part of this PR.
> 
> 1. switchRate attribute in JDK 11 onwards have the content type as frequency but pre JDK 11 the content type was number.
> 2. Pre JDK 9 the attribute name was javalangthread whereas post JDK 9 its thread.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.org/jmc/pull/411