RFR: 8294979: test/jdk/tools/jlink 3 test classes use ASM library

[Qing Xiao]

Modified 3 of 3 test/jdk/tools/jlink test classes to replace com.sun.tools.classfile library.

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Commit messages:
 - Dropped unnecessary exports.
 - Rollback the original format
 - 8294979: test/jdk/tools/jlink 3 test classes use ASM library

Changes: https://git.openjdk.org/jdk/pull/14877/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14877&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294979
  Stats: 11 lines in 3 files changed: 0 ins; 10 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14877.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14877/head:pull/14877

PR: https://git.openjdk.org/jdk/pull/14877