RFR: 8368885: NMT CommandLine tests can check for error better

[Paul Hübner]

On Mon, 29 Sep 2025 16:52:01 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> We can check for more specific error text when running the command line tests, the current 'error' string check misses NMT parsing succeeding but NMT initialization failure.
> 
> We also fix the indentation of the test files, let's use 4 spaces in the Java source files.

Thanks!

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Marked as reviewed by phubner (Author).

PR Review: https://git.openjdk.org/jdk/pull/27554#pullrequestreview-3283050071