RFR: 1184: Failure to retrieve the JBS bug should be an integration blocker

[Erik Joelsson]

This patch makes it an integration blocker if the Skara bot is unable to read an Issue in the issue tracker system that the PR is claiming to fix. The PR bot for github repos uses credentials that can only see publicly viewable bugs, so this will make it impossible for Oracle employees to accidentally use a "confidential" bug for change in OpenJDK.

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Commit messages:
 - Restore Issues list for missing issues
 - SKARA-1184

Changes: https://git.openjdk.java.net/skara/pull/1236/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1236&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1184
  Stats: 77 lines in 2 files changed: 56 ins; 6 del; 15 mod
  Patch: https://git.openjdk.java.net/skara/pull/1236.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1236/head:pull/1236

PR: https://git.openjdk.java.net/skara/pull/1236