RFR: 2348: Don't apply the logic of avoidForwardports if the issue has been resolved

[Zhao Song]

In [SKARA-2226](https://bugs.openjdk.org/browse/SKARA-2226), the issueNotifier was enhanced to avoid creating forward ports. However, there is a bug related with this feature. If the main issue has already been resolved and the fixVersion is targeted to release N-1, the issueNotifier will change the fixVersion to release N and create an open backport issue target to release N-1. The correct behavior should be to leave the main issue unchanged, create a backport target to release N, and resolve it accordingly.

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Commit messages:
 - SKARA-2348

Changes: https://git.openjdk.org/skara/pull/1683/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1683&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2348
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1683.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1683/head:pull/1683

PR: https://git.openjdk.org/skara/pull/1683