[code-reflection] Integrated: hat.java now scans the tests.jar for tests to run

[Gary Frost]

Previously we ha dto add each new test suite to `hat.java` now we scan the jar file for test suites.

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Commit messages:
 - hat.java now scans the tests.jar for tests to run
 - hat.java now scans the tests.jar for tests to run

Changes: https://git.openjdk.org/babylon/pull/598/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=598&range=00
  Stats: 10 lines in 1 file changed: 0 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/babylon/pull/598.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/598/head:pull/598

PR: https://git.openjdk.org/babylon/pull/598