RFR: 1408: GitLabMergeRequest#reviews sometimes finds the wrong commit HASH

[Guoxiong Li]

Hi all,

Please consider the following steps:

- the author creates "commit 1" locally (with hash "95f2d613cf392275075d7c87285845531f5fe827" [1])
- the author pushes it and creates a merge request in the Gitlab, then the Gitlab creates "version 1" [2] (its hash is the hash of "commit 1") which has the changed files of "commit 1"
- the author creates "commit 2" locally (with hash "99ca51edfa0063113a2236fce548ba453aee7275" [3])
- a reviewer approves the MR with the "**version 1**" in the Gitlab. Note: the "commit 2" is not pushed now.
- the author creates "commit 3" locally (with hash "50b119c4c325053b8151ea6e761a60d1acfbb746" [4]) Note: this step seems optional
- the author pushes the commits and the gitlab create "version 2" [5] (its hash is the hash of "commit 3") which has the changed files of "commit 1-3"

When we use the method `GitLabMergeRequest#reviews` to get the reviews list, we can see the review hash is the hash of the "commit 2" ("99ca51edfa0063113a2236fce548ba453aee7275"). But actually, the reviewer only approved "version 1" with hash of the "commit 1" ("95f2d613cf392275075d7c87285845531f5fe827").

This patch uses the `versions` list instead of all the `commits` list to fix the issue. And when I wrote a test case to verify it, I got a NPE and filed SKARA-1409 to record it. This patch also solves SKARA-1409 so that the reviewer can run the test locally.

You can use the following config to run the test:

gitlab.user=<your username in https://gitlab.com>
gitlab.pat=<your token in https://gitlab.com>

gitlab.uri=https://gitlab.com
gitlab.repository=35596381
gitlab.merge.request.id=2
gitlab.review.hash=95f2d613cf392275075d7c87285845531f5fe827


Note: this PR seems have git conflict with [SKARA-1407-PATCH](https://github.com/openjdk/skara/pull/1304). I will solve the conflict when one of them is integrated.

Thanks for taking the time to review.

Best Regards,
-- Guoxiong

[1] https://gitlab.com/lgxbslgx/test/-/merge_requests/2/diffs?commit_id=95f2d613cf392275075d7c87285845531f5fe827
[2] https://gitlab.com/lgxbslgx/test/-/merge_requests/2/diffs?diff_id=379883693
[3] https://gitlab.com/lgxbslgx/test/-/merge_requests/2/diffs?commit_id=99ca51edfa0063113a2236fce548ba453aee7275
[4] https://gitlab.com/lgxbslgx/test/-/merge_requests/2/diffs?commit_id=50b119c4c325053b8151ea6e761a60d1acfbb746
[5] https://gitlab.com/lgxbslgx/test/-/merge_requests/2/diffs?diff_id=379907777

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Commit messages:
 - Disable test.
 - 1409: The GitLab 'list-users' api doesn't return 'email' field for normal users
 - 1408: GitLabMergeRequest#reviews sometimes finds the wrong commit HASH

Changes: https://git.openjdk.java.net/skara/pull/1306/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1306&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1408
  Stats: 63 lines in 3 files changed: 58 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/skara/pull/1306.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1306/head:pull/1306

PR: https://git.openjdk.java.net/skara/pull/1306