Merge branch 'backport-ee-3706' into 'master'

Add eager-load paths to autoload paths to fix Rake tasks

See merge request gitlab-org/gitlab-ce!15940

config/application.rb

@@ -34,6 +34,10 @@ module Gitlab
 
     config.generators.templates.push("#{config.root}/generator_templates")
 
+    # Rake tasks ignore the eager loading settings, so we need to set the
+    # autoload paths explicitly
+    config.autoload_paths = config.eager_load_paths.dup
+
     # Only load the plugins named here, in the order given (default is alphabetical).
     # :all can be used as a placeholder for all plugins not explicitly named.
     # config.plugins = [ :exception_notification, :ssl_requirement, :all ]