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

[Zhao Song]

On Thu, 16 Feb 2023 17:03:58 GMT, Vijay Kulkarni <duke at openjdk.org> wrote:

>> 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.

LGTM

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Marked as reviewed by zsong (Committer).

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