Update projects in gitolite after namespace moved. Added rake task to cleanup garbage from gitolite

lib/tasks/gitlab/gitolite_rebuild.rake

@@ -23,5 +23,38 @@ namespace :gitlab do
         puts "... #{"done".green}"
       end
     end
+
+    desc "GITLAB | Cleanup gitolite config"
+    task :cleanup => :environment  do
+      warn_user_is_not_gitlab
+
+      real_repos = Project.all.map(&:path_with_namespace)
+      real_repos << "gitolite-admin"
+      real_repos << "@all"
+
+      remove_flag = ENV['REMOVE']
+
+      puts "Looking for repositories to remove... "
+      Gitlab::GitoliteConfig.new.apply do |config|
+        all_repos = []
+        garbage_repos = []
+
+        all_repos = config.conf.repos.keys
+        garbage_repos = all_repos - real_repos
+
+        garbage_repos.each do |repo_name|
+          if remove_flag
+            config.conf.rm_repo(repo_name)
+            print "to remove...".red
+          end
+
+          puts repo_name.red
+        end
+      end
+
+      unless remove_flag
+        puts "To cleanup repositories run this command with REMOVE=true".yellow
+      end
+    end
   end
 end