RFR: pr: always re-fetch PR for returned work items

[Erik Helin]

Hi all,

please review this patch that ensures that we always re-fetch a pull request before returning new work items. This is
to ensure that the returned work items never work on stale data.

Thanks,
Erik

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Commit messages:
 - pr: always re-fetch PR for returned work items

Changes: https://git.openjdk.java.net/skara/pull/841/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=841&range=00
  Stats: 8 lines in 2 files changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/841.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/841/head:pull/841

PR: https://git.openjdk.java.net/skara/pull/841