[crac] RFR: Handle open file descriptors with configurable policies [v3]

[Radim Vansa]

> When the application does not close some file descriptors through Resources we can use `jdk.crac.fd-policy.checkpoint` and `jdk.crac.fd-policy.restore` to configure the behaviour.
> 
> These properties can specify a list of File.pathSeparator-separated key=value pairs, where the key can be one of:
> 
> * numeric file descriptor
> * path using 'glob' pattern matching (see FileSystem.getPathMatcher() for details)
> * keywords FIFO and SOCKET that match pipes and sockets
> 
> The value should match one of possible values from OpenFDPolicies.BeforeCheckpoint and OpenFDPolicies.AfterRestore

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

  Effectively revert previous commit: Initialize logger in <clinit>

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Changes:
  - all: https://git.openjdk.org/crac/pull/69/files
  - new: https://git.openjdk.org/crac/pull/69/files/37cc0ac4..d9d9e48c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=69&range=02
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=69&range=01-02

  Stats: 7 lines in 1 file changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/crac/pull/69.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/69/head:pull/69

PR: https://git.openjdk.org/crac/pull/69