Migrate sidekiq queue to the new :hashed_storage namespace

`project_migrate_hashed_storage` is now
`hashed_storage:hashed_storage_project_migrate`

db/post_migrate/20190301081611_migrate_project_migrate_sidekiq_queue.rb

+# frozen_string_literal: true
+
+class MigrateProjectMigrateSidekiqQueue < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  DOWNTIME = false
+
+  def up
+    sidekiq_queue_migrate 'project_migrate_hashed_storage', to: 'hashed_storage:hashed_storage_project_migrate'
+  end
+
+  def down
+    sidekiq_queue_migrate 'hashed_storage:hashed_storage_project_migrate', to: 'project_migrate_hashed_storage'
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20190228092516) do
+ActiveRecord::Schema.define(version: 20190301081611) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"