Revert "Eager load `lib/api`"

This reverts commit 0a280158.

config/application.rb

@@ -102,8 +102,6 @@ module Gitlab
     # This is needed for gitlab-shell
     ENV['GITLAB_PATH_OUTSIDE_HOOK'] = ENV['PATH']
 
-    config.eager_load_paths += ["#{Rails.root}/lib"]
-
     config.generators do |g|
       g.factory_girl false
     end

config/routes.rb

 require 'sidekiq/web'
 require 'sidekiq/cron/web'
+require 'api/api'
 
 Rails.application.routes.draw do
   if Gitlab::Sherlock.enabled?

lib/api/api.rb

+Dir["#{Rails.root}/lib/api/*.rb"].each {|file| require file}
+
 module API
   class API < Grape::API
-    include ::API::APIGuard
+    include APIGuard
     version 'v3', using: :path
 
     rescue_from ActiveRecord::RecordNotFound do

lib/ci/api/api.rb

@@ -3,7 +3,7 @@ Dir["#{Rails.root}/lib/ci/api/*.rb"].each {|file| require file}
 module Ci
   module API
     class API < Grape::API
-      include ::API::APIGuard
+      include APIGuard
       version 'v1', using: :path
 
       rescue_from ActiveRecord::RecordNotFound do