Fix RoutingError at ./spec/features/milestones/milestones_spec.rb
Wait for ajax request to complete when testing milestont drang-n-drop feature.
For https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8278#note_20647177
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Wait for ajax request to complete when testing milestont drang-n-drop feature.
For https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8278#note_20647177