RFR: 1311: Pull Request not closed automatically

[Erik Joelsson]

If an integration gets interrupted or fails at the wrong time, a PR may end up in a state where it gets stuck without ever being closed. I fixed this by making sure we give any commit commands the chance to run even when a PR is marked as integrated.

I've also extended the test to verify recovering from interruption at each of the steps we take when integrating.

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Commit messages:
 - SKARA-1311

Changes: https://git.openjdk.java.net/skara/pull/1278/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1278&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1311
  Stats: 88 lines in 3 files changed: 41 ins; 29 del; 18 mod
  Patch: https://git.openjdk.java.net/skara/pull/1278.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1278/head:pull/1278

PR: https://git.openjdk.java.net/skara/pull/1278