[crac] RFR: JDKResource priorities [v2]

[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:

  Added JDKResource.Priority descriptio

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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/58f23f67..0a50fb1f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=crac&pr=8&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=crac&pr=8&range=00-01

  Stats: 12 lines in 1 file changed: 9 ins; 0 del; 3 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