Merge branch 'ee-8121-geo-search-bar' into 'master'

CE backport from  Added a search bar to `Admin > Geo > Projects`

See merge request gitlab-org/gitlab-ce!22747

app/views/shared/projects/_search_form.html.haml

@@ -21,3 +21,5 @@
 
   - if params[:visibility_level].present?
     = hidden_field_tag :visibility_level, params[:visibility_level]
+
+  = render_if_exists 'shared/projects/search_fields'