Deprecate InternalId concern and rename.

app/models/concerns/internal_id.rb → app/models/concerns/nonatomic_internal_id.rb

-module InternalId
+module NonatomicInternalId
   extend ActiveSupport::Concern
   included do

app/models/deployment.rb

 class Deployment < ActiveRecord::Base
-  include InternalId
+  include NonatomicInternalId
   belongs_to :project, required: true
   belongs_to :environment, required: true

app/models/issue.rb

 require 'carrierwave/orm/activerecord'
 class Issue < ActiveRecord::Base
-  include InternalId
+  include NonatomicInternalId
   include Issuable
   include Noteable
   include Referable

app/models/merge_request.rb

 class MergeRequest < ActiveRecord::Base
-  include InternalId
+  include NonatomicInternalId
   include Issuable
   include Noteable
   include Referable

app/models/milestone.rb

@@ -8,7 +8,7 @@ class Milestone < ActiveRecord::Base
   Started = MilestoneStruct.new('Started', '#started', -3)
   include CacheMarkdownField
-  include InternalId
+  include NonatomicInternalId
   include Sortable
   include Referable
   include StripAttribute

spec/models/merge_request_spec.rb

@@ -17,7 +17,7 @@ describe MergeRequest do
   describe 'modules' do
     subject { described_class }
-    it { is_expected.to include_module(InternalId) }
+    it { is_expected.to include_module(NonatomicInternalId) }
     it { is_expected.to include_module(Issuable) }
     it { is_expected.to include_module(Referable) }
     it { is_expected.to include_module(Sortable) }