RFR: Always recheck in-progress checks

[Robin Westberg]

If we end up wanting to run jcheck for a PR that has it marked as in progress, always rerun it. The only way this can happen is if the running check was interrupted (such as the process was killed), checks will never run concurrently for the same PR.

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Commit messages:
 - Always recheck in-progress checks

Changes: https://git.openjdk.java.net/skara/pull/957/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=957&range=00
  Stats: 34 lines in 1 file changed: 7 ins; 16 del; 11 mod
  Patch: https://git.openjdk.java.net/skara/pull/957.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/957/head:pull/957

PR: https://git.openjdk.java.net/skara/pull/957