RFR: 8286983: rename jdb -trackvthreads and debug agent enumeratevthreads options and clarify "Preview Feature" nature of these options [v3]

Thu May 26 16:53:33 UTC 2022

On Thu, 26 May 2022 03:47:35 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Again I have to say I agree with Chris. The flag itself is a "preview" flag and relates to a "preview feature". If the feature goes obviously the flag does too, but the flag could go even if the feature stays.
>
> Please see the discussion with Alex in [JDK-8286983](https://bugs.openjdk.java.net/browse/JDK-8286983)

This PR has been updated to reflect the discussion in [JDK-8286983](https://bugs.openjdk.java.net/browse/JDK-8286983). Please re-review.

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PR: https://git.openjdk.java.net/jdk/pull/8780