Disable AddColumnWithDefaultToLargeTable cop for pre-existing migrations

db/migrate/20160419122101_add_only_allow_merge_if_build_succeeds_to_projects.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddOnlyAllowMergeIfBuildSucceedsToProjects < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20160608195742_add_repository_storage_to_projects.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddRepositoryStorageToProjects < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20160715154212_add_request_access_enabled_to_projects.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddRequestAccessEnabledToProjects < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20160715204316_add_request_access_enabled_to_groups.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddRequestAccessEnabledToGroups < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20160831223750_remove_features_enabled_from_projects.rb

 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class RemoveFeaturesEnabledFromProjects < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20160913162434_remove_projects_pushes_since_gc.rb

 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class RemoveProjectsPushesSinceGc < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 

db/migrate/20170124193147_add_two_factor_columns_to_namespaces.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddTwoFactorColumnsToNamespaces < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 

db/migrate/20170124193205_add_two_factor_columns_to_users.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddTwoFactorColumnsToUsers < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 

db/migrate/20170301125302_add_printing_merge_request_link_enabled_to_project.rb

 # See http://doc.gitlab.com/ce/development/migration_style_guide.html
 # for more information on how to write migrations for GitLab.
 
+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddPrintingMergeRequestLinkEnabledToProject < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20170305180853_add_auto_cancel_pending_pipelines_to_project.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class AddAutoCancelPendingPipelinesToProject < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 

db/migrate/20170315174634_revert_add_notified_of_own_activity_to_users.rb

+# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 class RevertAddNotifiedOfOwnActivityToUsers < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!