RFR: 7256: Use .jcheck/conf property to control version [v2]

[Marcus Hirt]

> See Erik Joelsson's comment in https://bugs.openjdk.java.net/browse/SKARA-1033.

Marcus Hirt has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  7256: Use .jcheck/conf property to control version

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/249/files
  - new: https://git.openjdk.java.net/jmc/pull/249/files/1e8785da..608cbc6a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=249&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=249&range=00-01

  Stats: 151 lines in 6 files changed: 3 ins; 137 del; 11 mod
  Patch: https://git.openjdk.java.net/jmc/pull/249.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/249/head:pull/249

PR: https://git.openjdk.java.net/jmc/pull/249