RFR: 8333013: Update vmTestbase/nsk/share/LocalProcess.java to don't use finalization

[Leonid Mesnik]

The vmTestbase/nsk/share/LocalProcess.java is a wrapper for debuggee process. It extends FinalizableObject to kill the debuggee process.

The debuggee process is used by nsk.jdb tests only, see runTest(...) in vmTestbase/nsk/share/jdb/JdbTest.java:
https://github.com/openjdk/jdk/blob/master/test/hotspot/jtreg/vmTestbase/nsk/share/jdb/JdbTest.java#L189

I verified that process is always already terminated when is cleaned during VM shutdown hook,
So the fix is just to remove the finalization.

I also moved LocalProcess into nsk.share.jdb to reduce the visibility of class and hardened checks in runTest.

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Commit messages:
 - 8333013: Update vmTestbase/nsk/share/LocalProcess.java to don't use finalization

Changes: https://git.openjdk.org/jdk/pull/19418/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19418&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333013
  Stats: 343 lines in 3 files changed: 156 ins; 179 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/19418.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19418/head:pull/19418

PR: https://git.openjdk.org/jdk/pull/19418