Merge branch 'sh-mute-notifications-seeder' into 'master'

Mute notifications in the seeder to speed GDK development

See merge request gitlab-org/gitlab-ce!16747

lib/gitlab/seeder.rb

@@ -5,9 +5,15 @@ module DeliverNever
   end
 end
 
+module MuteNotifications
+  def new_note(note)
+  end
+end
+
 module Gitlab
   class Seeder
     def self.quiet
+      mute_notifications
       mute_mailer
 
       SeedFu.quiet = true
@@ -18,6 +24,10 @@ module Gitlab
       puts "\nOK".color(:green)
     end
 
+    def self.mute_notifications
+      NotificationService.prepend(MuteNotifications)
+    end
+
     def self.mute_mailer
       ActionMailer::MessageDelivery.prepend(DeliverNever)
     end