RFR: 8259267: Refactor LoaderLeak shell test as java test. [v4]

[Ivan Šipka]

> Refactor `test/jdk/java/lang/annotation/loaderLeak/LoaderLeak.sh` as java test.

Ivan Šipka has updated the pull request incrementally with one additional commit since the last revision:

  trying to manipulate effective jtreg classpath

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1577/files
  - new: https://git.openjdk.java.net/jdk/pull/1577/files/fc0af133..a5ef036d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1577&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1577&range=02-03

  Stats: 397 lines in 2 files changed: 200 ins; 197 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1577.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1577/head:pull/1577

PR: https://git.openjdk.java.net/jdk/pull/1577