Merge branch 'fix-admin-group-plan-row' into 'master'

Fix admin group plan row

Closes #6482

See merge request gitlab-org/gitlab-ee!6209

ee/app/views/admin/_namespace_plan.html.haml

 - return unless Gitlab::CurrentSettings.should_check_namespace_plan?
 
-.form-group
-  = f.label :plan, class: 'col-form-label'
+.form-group.row
+  = f.label :plan, class: 'col-form-label col-sm-2'
   .col-sm-10
     = f.select :plan_id, Plan.pluck(:title, :id),
       { include_blank: 'No plan' },