Fix Rubocop offenses for EE migrations

db/migrate/20161007073613_create_user_activities.rb

-# rubocop:disable Migration/Timestamps
-# rubocop:disable Migration/Datetime
+
 class CreateUserActivities < ActiveRecord::Migration
   # Set this constant to true if this migration requires downtime.
   DOWNTIME = true

db/post_migrate/20161128170531_drop_user_activities_table.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/Datetime
 class DropUserActivitiesTable < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 

ee/db/migrate/20151007110107_update_group_links.rb

-# rubocop:disable Rails/ReversibleMigration
 class UpdateGroupLinks < ActiveRecord::Migration
   def change
     provider = quote_string(Gitlab::Auth::LDAP::Config.providers.first)

ee/db/migrate/20151113115819_canonicalize_kerberos_identities.rb

@@ -19,6 +19,7 @@ class CanonicalizeKerberosIdentities < ActiveRecord::Migration
 
   def change
     reversible do |dir|
+      # rubocop:disable Cop/AvoidReturnFromBlocks
       return unless kerberos_default_realm.present?
 
       dir.up do

ee/db/migrate/20160129075828_create_index_statuses.rb

 # rubocop:disable Migration/Timestamps
-# rubocop:disable Migration/Datetime
 class CreateIndexStatuses < ActiveRecord::Migration
   def change
     create_table :index_statuses do |t|

ee/db/migrate/20160321161032_create_remote_mirrors_ee.rb

-# rubocop:disable Migration/Datetime
 # rubocop:disable Migration/Timestamps
 class CreateRemoteMirrorsEE < ActiveRecord::Migration
   def up

ee/db/migrate/20160718210912_add_ldap_sync_state_to_groups.rb

 # Migration type: online without errors (works on previous version and new one)
-# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 # rubocop:disable Migration/Datetime
 # rubocop:disable Migration/UpdateLargeTable
 class AddLdapSyncStateToGroups < ActiveRecord::Migration

ee/db/migrate/20161230123835_add_squash_to_merge_requests_ee.rb

-# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 # rubocop:disable Migration/UpdateLargeTable
 class AddSquashToMergeRequestsEE < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

ee/db/migrate/20170120123345_add_column_auditor_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 Migration/AddColumnWithDefaultToLargeTable
 # rubocop:disable Migration/UpdateLargeTable
 class AddColumnAuditorToUsers < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

ee/db/migrate/20170130113559_add_sync_schedule_to_projects_and_remote_projects.rb

-# rubocop:disable Migration/AddColumnWithDefaultToLargeTable
 # rubocop:disable Migration/UpdateLargeTable
 class AddSyncScheduleToProjectsAndRemoteProjects < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers

ee/db/migrate/20170522194603_create_geo_repository_updated_events.rb

-# rubocop:disable Migration/Datetime
 class CreateGeoRepositoryUpdatedEvents < ActiveRecord::Migration
   DOWNTIME = false
 

ee/db/migrate/20170522201800_create_geo_event_log.rb

-# rubocop:disable Migration/Datetime
 class CreateGeoEventLog < ActiveRecord::Migration
   DOWNTIME = false
 

ee/db/migrate/20180206184810_create_project_repository_states.rb

-  class CreateProjectRepositoryStates < ActiveRecord::Migration
+class CreateProjectRepositoryStates < ActiveRecord::Migration
   DOWNTIME = false
 
   def change

ee/db/migrate/20180209115333_create_chatops_tables.rb

@@ -18,6 +18,7 @@ class CreateChatopsTables < ActiveRecord::Migration
       t.index :pipeline_id, unique: true
     end
 
+    # rubocop:disable Migration/AddConcurrentForeignKey
     add_foreign_key :ci_pipeline_chat_data, :ci_pipelines,
       column: :pipeline_id,
       on_delete: :cascade

ee/db/migrate/20180315160435_add_external_auth_mutual_tls_fields_to_project_settings.rb

 class AddExternalAuthMutualTlsFieldsToProjectSettings < ActiveRecord::Migration
-
   DOWNTIME = false
 
   def change

ee/db/migrate/20180423165301_add_negative_matching_commit_message_push_rule.rb

@@ -11,4 +11,3 @@ class AddNegativeMatchingCommitMessagePushRule < ActiveRecord::Migration
     remove_column :push_rules, :commit_message_negative_regex
   end
 end
-

ee/db/migrate/20180503154922_add_indexes_to_project_mirror_data_ee.rb

@@ -10,6 +10,7 @@ class AddIndexesToProjectMirrorDataEE < ActiveRecord::Migration
   end
 
   def down
+    # rubocop:disable Migration/RemoveIndex
     remove_index :project_mirror_data, :last_successful_update_at if index_exists? :project_mirror_data, :last_successful_update_at
   end
 end

ee/db/migrate/20180612175636_add_geo_nodes_verification_max_capacity.rb

@@ -4,6 +4,7 @@ class AddGeoNodesVerificationMaxCapacity < ActiveRecord::Migration
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddColumn
     add_column :geo_nodes, :verification_max_capacity, :integer, default: 100, null: false
   end
 end

ee/db/post_migrate/20180417102933_drop_repository_storage_events_for_geo_events.rb

@@ -29,6 +29,7 @@ class DropRepositoryStorageEventsForGeoEvents < ActiveRecord::Migration
   private
 
   def update_repository_storage_path(table)
+    # rubocop:disable Migration/UpdateColumnInBatches
     update_column_in_batches(table, :repository_storage_path, update_statement) do |t, q|
       q.where(t[:repository_storage_path].eq(nil))
     end