RFR: JDK-8266254: Update to use jtreg 6 [v2]

[Erik Joelsson]

On Wed, 2 Jun 2021 20:15:55 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review the change to update to using jtreg 6. 
>> 
>> The primary change is to the jib-profiles.js file, which specifies the version of jtreg to use, for those systems that rely on this file. In addition, the `requiredVersion` has been updated in the various `TEST.ROOT` files.
>> 
>> All the tests that could be updated ahead of time have been updated. There are a few tests remaining that need to be done at this time, because of the change in the module name for TestNG 7.3. It changed from a default of `testng` to an explicit `org.testng`.
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyright years

This PR wasn't handled properly when integrated. The change looks like it was pushed correctly and the bug was updated, so we are only missing some book keeping in the PR. I've filed https://bugs.openjdk.java.net/browse/SKARA-1069.

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PR: https://git.openjdk.java.net/jdk/pull/4315