RFR: 309: Backport creation fails

[Robin Westberg]

Hi all,

Please review this change that ensures that only known properties are set when creating an issue.

Best regards,
Robin

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Commit messages:
 - Only set known properties when creating an issue

Changes: https://git.openjdk.java.net/skara/pull/511/files
 Webrev: https://webrevs.openjdk.java.net/skara/511/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-309
  Stats: 15 lines in 2 files changed: 6 ins; 7 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/511.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/511/head:pull/511

PR: https://git.openjdk.java.net/skara/pull/511