Delete temporary branches after an import

lib/gitlab/bitbucket_server_import/importer.rb

@@ -29,6 +29,7 @@ module Gitlab
       def execute
         import_repository
         import_pull_requests
+        delete_temp_branches
         handle_errors
 
         true
@@ -142,6 +143,17 @@ module Gitlab
         end
       end
 
+      def delete_temp_branches
+        @temp_branches.each do |branch_name|
+          begin
+            client.delete_branch(project_key, repository_slug, branch_name)
+            project.repository.delete_branch(branch_name)
+          rescue BitbucketServer::Connection::ConnectionError => e
+            @errors << { type: :delete_temp_branches, branch_name: branch_name, errors: e.message }
+          end
+        end
+      end
+
       def import_bitbucket_pull_request(pull_request)
         description = ''
         description += @formatter.author_line(pull_request.author) unless find_user_id(pull_request.author_email)