RFR: 8295059: test/langtools/tools/javap 12 test classes use com.sun.tools.classfile library

[Qing Xiao]

Modified 10 of 12 test/langtools/tools/javap test classes to replace com.sun.tools.classfile library.

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Commit messages:
 - Modified test/langtools/tools/javap/classfile/6888367/T6888367.java
 - 8295059: test/langtools/tools/javap 10 tests classes use com.sun.tools.classfile library

Changes: https://git.openjdk.org/jdk/pull/14837/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14837&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295059
  Stats: 718 lines in 11 files changed: 128 ins; 196 del; 394 mod
  Patch: https://git.openjdk.org/jdk/pull/14837.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14837/head:pull/14837

PR: https://git.openjdk.org/jdk/pull/14837