Fix common test runner.
Fix common test runner.

GoogleCloudPlatform/appengine-pipelines,aozarov/appengine-pipelines,googlecloudplatform/appengine-pipelines,VirusTotal/appengine-pipelines,aozarov/appengine-pipelines,Loudr/appengine-pipelines,vendasta/appengine-pipelines,vendasta/appengine-pipelines,Loudr/appengine-pipelines,Loudr/appengine-pipelines,Loudr/appengine-pipelines,GoogleCloudPlatform/appengine-pipelines,VirusTotal/appengine-pipelines,vendasta/appengine-pipelines,googlecloudplatform/appengine-pipelines,aozarov/appengine-pipelines,aozarov/appengine-pipelines,VirusTotal/appengine-pipelines,googlecloudplatform/appengine-pipelines,googlecloudplatform/appengine-pipelines,GoogleCloudPlatform/appengine-pipelines,Loudr/appengine-pipelines,GoogleCloudPlatform/appengine-pipelines,googlecloudplatform/appengine-pipelines,aozarov/appengine-pipelines,vendasta/appengine-pipelines,VirusTotal/appengine-pipelines,GoogleCloudPlatform/appengine-pipelines,vendasta/appengine-pipelines,VirusTotal/appengine-pipelines