Merge branch 'fix-group-boards-migration-name' into 'master'

Fix group boards migration name

See merge request gitlab-org/gitlab-ce!17592

db/migrate/20180227182112_add_group_id_to_boards.rb → db/migrate/20180227182112_add_group_id_to_boards_ce.rb

-class AddGroupIdToBoards < ActiveRecord::Migration
+class AddGroupIdToBoardsCe < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 
   disable_ddl_transaction!