Add remove_concurrent_index to database helper

changelogs/unreleased/add_remove_concurrent_index_to_database_helper.yml

+---
+title: Add remove_concurrent_index to database helper
+merge_request: 10441
+author: blackst0ne

db/migrate/20160615142710_add_index_on_requested_at_to_members.rb

+# rubocop:disable RemoveIndex
 class AddIndexOnRequestedAtToMembers < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160616103005_remove_keys_fingerprint_index_if_exists.rb

+# rubocop:disable RemoveIndex
 class RemoveKeysFingerprintIndexIfExists < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160616103948_add_unique_index_to_keys_fingerprint.rb

+# rubocop:disable RemoveIndex
 class AddUniqueIndexToKeysFingerprint < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160620115026_add_index_on_runners_locked.rb

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

db/migrate/20160715134306_add_index_for_pipeline_user_id.rb

+# rubocop:disable RemoveIndex
 class AddIndexForPipelineUserId < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160725104020_merge_request_diff_remove_uniq.rb

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

db/migrate/20160725104452_merge_request_diff_add_index.rb

+# rubocop:disable RemoveIndex
 class MergeRequestDiffAddIndex < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
   disable_ddl_transaction!

db/migrate/20160802010328_remove_builds_enable_index_on_projects.rb

+# rubocop:disable RemoveIndex
 class RemoveBuildsEnableIndexOnProjects < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160803161903_add_unique_index_to_lists_label_id.rb

+# rubocop:disable RemoveIndex
 class AddUniqueIndexToListsLabelId < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160805041956_add_deleted_at_to_namespaces.rb

+# rubocop:disable RemoveIndex
 class AddDeletedAtToNamespaces < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160808085602_add_index_for_build_token.rb

+# rubocop:disable RemoveIndex
 class AddIndexForBuildToken < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160810142633_remove_redundant_indexes.rb

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

db/migrate/20160819221631_add_index_to_note_discussion_id.rb

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

db/migrate/20160819232256_add_incoming_email_token_to_users.rb

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

db/migrate/20160919145149_add_group_id_to_labels.rb

+# rubocop:disable RemoveIndex
 class AddGroupIdToLabels < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20160920160832_add_index_to_labels_title.rb

+# rubocop:disable RemoveIndex
 class AddIndexToLabelsTitle < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20161017125927_add_unique_index_to_labels.rb

+# rubocop:disable RemoveIndex
 class AddUniqueIndexToLabels < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

db/migrate/20161020083353_add_pipeline_id_to_merge_request_metrics.rb

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

db/migrate/20161031181638_add_unique_index_to_subscriptions.rb

+# rubocop:disable RemoveIndex
 class AddUniqueIndexToSubscriptions < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers