RFR: 1035: Race when creating backports for bug spanning multiple repos

[vijayk22oracle]

SKARA-1035: Race when creating backports for bug spanning multiple repos

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Commit messages:
 - SKARA-1035: Race when creating backports for bug spanning multiple repos
 - SKARA-1035: Race when creating backports for bug spanning multiple repos

Changes: https://git.openjdk.org/skara/pull/1474/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1474&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1035
  Stats: 13 lines in 1 file changed: 11 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1474.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1474/head:pull/1474

PR: https://git.openjdk.org/skara/pull/1474