[crac] RFR: JDKResource priorities [v4]

[Alexey Bakhtin]

> Added priority enumeration for the JDK resources
> It will allow better handling the order of checkpoint notifications for dependent resources

Alexey Bakhtin has updated the pull request incrementally with one additional commit since the last revision:

  Use compareTo() to compare enums

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Changes:
  - all: https://git.openjdk.java.net/crac/pull/8/files
  - new: https://git.openjdk.java.net/crac/pull/8/files/f1140138..72441c8e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=crac&pr=8&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=crac&pr=8&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/crac/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/crac pull/8/head:pull/8

PR: https://git.openjdk.java.net/crac/pull/8