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

[Vijay Kulkarni]

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

Vijay Kulkarni has updated the pull request incrementally with one additional commit since the last revision:

  Caught more specific exception in case of backport fails & updated error message.

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Changes:
  - all: https://git.openjdk.org/skara/pull/1476/files
  - new: https://git.openjdk.org/skara/pull/1476/files/84026657..2b7510f8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1476&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1476&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 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