[jdk25u] RFR: 8362123: ClassLoader Leak via Executors.newSingleThreadExecutor(...)

[Chris Dennis]

This is a backport of d5a207994b9c374e6638e57826326f8f4593b96b from openjdk/jdk which is a bug-fix of JDK-8362123.

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Commit messages:
 - Backport d5a207994b9c374e6638e57826326f8f4593b96b

Changes: https://git.openjdk.org/jdk25u/pull/295/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=295&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362123
  Stats: 65 lines in 2 files changed: 63 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u/pull/295.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/295/head:pull/295

PR: https://git.openjdk.org/jdk25u/pull/295