can't config the artifacts store path in the omnibus-gitlab

https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/templates/default/gitlab.yml.erb#L111

https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/gitlab.yml.example#L135

The name of the artifacts path is different between the tow files. So the value of gitlab_rails['artifacts_path'] doesn't work in the omnibus-gitlab.