[crac] RFR: Close extraneous file descriptors [v3]

[Radim Vansa]

> Java code cannot use inherited non-standard file descriptors; these can cause trouble when trying to checkpoint the process via CRIU, and hence we will proactively close them on boot.

Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:

  Comments and change in logging

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Changes:
  - all: https://git.openjdk.org/crac/pull/45/files
  - new: https://git.openjdk.org/crac/pull/45/files/4c5afa58..2da79441

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=45&range=02
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=45&range=01-02

  Stats: 6 lines in 2 files changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/crac/pull/45.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/45/head:pull/45

PR: https://git.openjdk.org/crac/pull/45