RFR: JDK-8296443 NMT: Remove cmdline_tracking_level handling code

[David Holmes]

On Sun, 6 Nov 2022 09:03:00 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Trivial cleanup.
> 
> NMT tracking level had been shadowed by `_cmdline_tracking_level` to notice tracking level degradation due to resource exhaustion. All that tracking level handling has simplified with [8256844](https://bugs.openjdk.org/browse/JDK-8256844). Coding can be removed.

Seems fine (  lot of effort just to issue a notice to the user).

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11006