[crac] RFR: 8349819: [CRaC] Support FD policy reopen on listening socket [v4]

[Radim Vansa]

> Adds additional filtering option for `type: SOCKET` in OpenResourcePolicies: `listening: true` which is true for common server sockets. 
> With `action: reopen` these implement automatic close on checkpoint and reopening on restore, using the same local address (this obviously won't work well if the restore happens on a machine that does not have the IP used before checkpoint).

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

  Make implReopen abstract

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Changes:
  - all: https://git.openjdk.org/crac/pull/204/files
  - new: https://git.openjdk.org/crac/pull/204/files/120f1c29..aabcff14

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=204&range=03
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=204&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/204.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/204/head:pull/204

PR: https://git.openjdk.org/crac/pull/204