RFR: 1029: Skara bot should prevent integration of PR with incorrect issue type

[Erik Helin]

Hi all,

please review this patch that makes using a issue of type other than "Bug", "Enhancement", "Task", "Sub-task" or "New Feature" an integration blocker. We currently issue a warning, this warning has now been changed to an integration blocker.

Testing:
- [x] Updated a number of unit tests

Thanks,
Erik

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Commit messages:
 - skara-1029

Changes: https://git.openjdk.java.net/skara/pull/1162/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1162&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1029
  Stats: 32 lines in 3 files changed: 13 ins; 4 del; 15 mod
  Patch: https://git.openjdk.java.net/skara/pull/1162.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1162/head:pull/1162

PR: https://git.openjdk.java.net/skara/pull/1162