remove rack attack middleware update
Hasn't changed since 7.2 release: https://github.com/gitlabhq/gitlabhq/commits/master/config/initializers/rack_attack.rb.example
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Hasn't changed since 7.2 release: https://github.com/gitlabhq/gitlabhq/commits/master/config/initializers/rack_attack.rb.example