RFR: 1080: /backport command reports conflict even though there isn't any

[Kevin Rushforth]

On Tue, 15 Jun 2021 00:31:03 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This patch fixes a bug with the /backport commit command. It currently materializes the workspace where the cherry-picking is done from the wrong repository. It should be using the target repository, but instead it's using the "fork" (which is the repo from which we create the pull request if /backport is successful). 
> 
> In the tests, this wasn't handled at all. All the tests used the same hosted repository for the "fork" as the target. I introduced a separate "fork" repository in the tests where it would make a difference. 
> 
> I changed the backportDoesNotApply test so that it would fail without this fix. I also think I made it clearer why the backport shouldn't apply as well.
> 
> Finally I added a new test which verifies a situation very similar to the original issue reported.

Looks good.

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Marked as reviewed by kcr (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/1188