This fixesgitlab-org/gitlab-ce#49953, as noted in the documentation
this feature is intended to be used when SSH certificates are
enabled. Then this warning becomes not only pointless, but also
misleading.
This builds on top of gitlab-org/gitlab-ce!21009 since both need to
modify the same documentation, which avoids a merge conflict.
See also the gitlab-org/gitlab-ce#49218 issue and associated merge
request.
Why and how to enable this is covered in the docs being changed
here. This requires gitlab-org/gitlab-shell@2e8b670 ("Add support for
SSH certificate authentication", 2018-06-14) which has been merged in
and tagged as 8.0.0, so GITLAB_SHELL_VERSION needs to be bumped.
Merging this closesgitlab-org/gitlab-ce#34572 see
gitlab-org/gitlab-shell!207 for the gitlab-shell MR.
Implementation notes:
- The APIs being changed here are all internal, and their sole
consumer is gitlab-shell.
- Most of the changed code is a MR to gitlab-shell, see the
gitlab-org/gitlab-shell!207 MR. That change covers why only some of
the internal methods get a new "username" parameter, and why some
others only get a "user_id".
