RFR: 7903300: Add test library support to jtreg plugin

[Maurizio Cimadamore]

On Sun, 11 Sep 2022 13:06:20 GMT, Guoxiong Li <gli at openjdk.org> wrote:

> Hi all,
> 
> Currently, when we open a jtreg test file which uses the JUnit or TestNG, the plugin can't identify the related classes of the JUnit or TestNG. So the statement such as `import org.junit.Test` is marked as red with error message `Cannot resolve symbol 'junit'`.
> 
> This patch adds the jtreg libraries directory to the lib path of the `Jetbrains IDEA` when opening the JUnit or TestNG test files so that the `Jetbrains IDEA` can identify the related classes.
> 
> Thanks for taking the time to review.
> 
> Best Regards,
> -- Guoxiong

Also, when updating the plugin, it is better to update the `gradle.properties` file to bump the version, and to include some notes (e.g. bug number and synopsis). This will allow upgrade to occur smoothly (and issues to be pinpointed correctly).

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PR: https://git.openjdk.org/jtreg/pull/117