RFR: 2033: Require all bugs to be accessible before marking PR 'rfr'

[Zhao Song]

If one or more issues associated with the pull request is not accessible, then the pull request should be considered as invalid. Also, no 'rft' label will be added to this pull request and this could help prevent emails from being sent out while the pull request is associated with invalid issues.

-------------

Commit messages:
 - SKARA-2033

Changes: https://git.openjdk.org/skara/pull/1560/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1560&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2033
  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1560.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1560/head:pull/1560

PR: https://git.openjdk.org/skara/pull/1560