[skara] RFR: 785: Failed tag updates are not automatically retried

[Robin Westberg]

When the issue notifier encounters an error during tag processing, it flags the tag as in need of retry. However, the retry flag was not actually checked in subsequent runs.

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Commit messages:
 - Check if a tag update is marked for retry

Changes: https://git.openjdk.java.net/skara/pull/1060/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1060&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-785
  Stats: 101 lines in 2 files changed: 97 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/skara/pull/1060.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1060/head:pull/1060

PR: https://git.openjdk.java.net/skara/pull/1060