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

Changes: https://git.openjdk.org/skara/pull/1476/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1476&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1035
  Stats: 12 lines in 1 file changed: 11 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1476.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1476/head:pull/1476

PR: https://git.openjdk.org/skara/pull/1476