Move container images migration to the present time

db/migrate/20161031013926_create_container_image.rb → db/migrate/20170322013926_create_container_image.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class CreateContainerImage < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 
-  # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
   def change