[jdk11u-dev] RFR: 8251126: nsk.share.GoldChecker should read golden file from ${test.src}

[Goetz Lindenmaier]

This test cleanup is a clean backport and simplifies follow-up backports.

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Commit messages:
 - Backport b37b1a391a467d1670fc8c4b236a6c4c5518bef6

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/767/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=767&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251126
  Stats: 37 lines in 1 file changed: 7 ins; 20 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/767.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/767/head:pull/767

PR: https://git.openjdk.java.net/jdk11u-dev/pull/767