Only search gitlab:import:repos on repos on subdir

of type `repos_path/group/repo.git`.

Before this, any other location like `repos_path/repo.git`
or `repos_path/group/XXX/repo.git` does generate new projects, but
these projects are empty since no copy is done.

doc/raketasks/import.md

@@ -11,8 +11,14 @@ Notes:
 
 How to use:
 
-1. copy your bare repos under git repos_path (see `config/gitlab.yml` gitlab_shell -> repos_path)
-1. run the command below
+1.  copy your bare repos under a subdirectory of the git repos_path
+    (see `config/gitlab.yml` gitlab_shell -> repos_path)
+
+    For example: `repositories/new-group/repository.git`.
+
+    The repository path must end in `.git`.
+
+1.  run the command below
 
 ```
 # omnibus-gitlab

lib/tasks/gitlab/import.rake

@@ -13,7 +13,7 @@ namespace :gitlab do
     task repos: :environment do
 
       git_base_path = Gitlab.config.gitlab_shell.repos_path
-      repos_to_import = Dir.glob(git_base_path + '/**/*.git')
+      repos_to_import = Dir.glob(git_base_path + '/*/*.git')
 
       namespaces = Namespace.pluck(:path)