RFR: 8284490: Remove finalizer method in java.security.jgss

[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.

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Commit messages:
 - 8284490: Remove finalizer method in java.security.jgss

Changes: https://git.openjdk.java.net/jdk/pull/8136/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8136&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284490
  Stats: 40 lines in 3 files changed: 20 ins; 15 del; 5 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