Merge branch 'deprecated-ee-migrations-inheritance' into 'master'

ActiveRecord::Migration -> ActiveRecord::Migration[5.0] for
AddAlertManagerTokenToClustersApplicationPrometheus and EnqueuePrometheusUpdates

See merge request gitlab-org/gitlab-ee!9049

ee/changelogs/unreleased/deprecated-ee-migrations-inheritance.yml

+---
+title: ActiveRecord::Migration -> ActiveRecord::Migration[5.0] for AddAlertManagerTokenToClustersApplicationPrometheus
+  and EnqueuePrometheusUpdates
+merge_request: 9049
+author: Jasper Maes
+type: other

ee/db/migrate/20181026085436_add_alert_manager_token_to_clusters_application_prometheus.rb

 # frozen_string_literal: true
 
-class AddAlertManagerTokenToClustersApplicationPrometheus < ActiveRecord::Migration
+class AddAlertManagerTokenToClustersApplicationPrometheus < ActiveRecord::Migration[5.0]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false

ee/db/post_migrate/20181115140251_enqueue_prometheus_updates.rb

 # frozen_string_literal: true
 
-class EnqueuePrometheusUpdates < ActiveRecord::Migration
+class EnqueuePrometheusUpdates < ActiveRecord::Migration[5.0]
   include Gitlab::Database::MigrationHelpers
 
   DOWNTIME = false