RFR: 8284490: Remove finalizer method in java.security.jgss [v4]

[Xue-Lei Andrew Fan]

> Please review the update to remove finalizer method in the java.security.jgss module. It is one of the efforts to clean up the use of finalizer method in JDK.

Xue-Lei Andrew Fan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - add test cases
 - Merge
 - Update copyright year
 - the object reference issue for Cleaner
 - 8284490: Remove finalizer method in java.security.jgss

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8136/files
  - new: https://git.openjdk.java.net/jdk/pull/8136/files/23072ef7..464d3981

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8136&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8136&range=02-03

  Stats: 3287 lines in 428 files changed: 1330 ins; 532 del; 1425 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8136.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8136/head:pull/8136

PR: https://git.openjdk.java.net/jdk/pull/8136