8309138: Fix container tests for jdks with symlinked conf dir

[sendaoYan]

Hi all This is backport of JDK-8309138, to fix the testcase bug, which if the tested jdk directory is symlinked, symlinks are followed when copying tested jdk. Only change the testcase lib file, the risk is low.

Additional testing:

• [x] jdk/test/jdk/internal/platform/docker

docker-tests.log

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Progress

• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8309138 needs maintainer approval

Issue

• JDK-8309138: Fix container tests for jdks with symlinked conf dir (Bug - P4 - Requested)

Reviewers

• Paul Hohensee (@phohensee - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev.git pull/538/head:pull/538
$ git checkout pull/538

Update a local copy of the PR:
$ git checkout pull/538
$ git pull https://git.openjdk.org/jdk8u-dev.git pull/538/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 538

View PR using the GUI difftool:
$ git pr show -t 538

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/538.diff

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