Because of a change in GitLab 9.5.4 to prevent users from assuming control of
a repository already on disk, the import task broke. Imports would fail with
the message, "There is already a repository with that name on disk".
This change skips the validation when the import is done from the
command-line.
Closes#37682
- Allow imports into nested groups
- Make sure it sets the correct visibility level when creating new
groups
While doing this, I moved the import into a testable class, that made
it easier to improve.
