RFR: 1035: Race when creating backports for bug spanning multiple repos [v2]

[vijayk22oracle]

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

vijayk22oracle has updated the pull request incrementally with two additional commits since the last revision:

 - Merge master
 - Merge master

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1474/files
  - new: https://git.openjdk.org/skara/pull/1474/files/084ba42f..51613841

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1474&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1474&range=00-01

  Stats: 4853 lines in 458 files changed: 3133 ins; 643 del; 1077 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