Integrated: 634: Refresh PR data between commands in CommandWorkItem

[Erik Helin]

Hi all,

please review this patch that ensures that the pull request data is re-fetched between commands are being run (since
commands can affect the PR state).

Testing:
- [x] `make test` passes on Linux x64
- [x] Added a new unit test

Thanks,
Erik

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Commit messages:
 - 634

Changes: https://git.openjdk.java.net/skara/pull/813/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=813&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-634
  Stats: 63 lines in 3 files changed: 59 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/skara/pull/813.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/813/head:pull/813

PR: https://git.openjdk.java.net/skara/pull/813