RFR: JDK-8274170: Add hooks for custom makefiles to augment jtreg test execution

Thu Sep 23 22:10:17 UTC 2021

On Thu, 23 Sep 2021 22:02:07 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

> Please review this small change that adds hook for custom makefiles to augment parameters for jtreg test execution.

Testing: 
  - tested with custom make file to make sure the feature works
  - ran a variety of test framework combinations via make to ensure no negative side effects are introduced into this change
     (jtreg, jtreg with params, jtreg+gtest, jtreg+micros). See comments in RFE for details.

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PR: https://git.openjdk.java.net/jdk/pull/5666