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

[Naoto Sato]

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 and explicit `org.testng`.
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update copyright years

Marked as reviewed by naoto (Reviewer).

-------------

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