Merge branch 'blackst0ne-fix-downtime-check-job' into 'master'

Fix `downtime_check` job

See merge request gitlab-org/gitlab-ce!18840

db/migrate/20140313092127_init_schema.rb

 class InitSchema < ActiveRecord::Migration
+  DOWNTIME = true
+
   def up
     create_table "broadcast_messages", force: :cascade do |t|
       t.text "message", null: false