Configure Kokoro for releases (#6733)
Configure Kokoro for releases (#6733)


tseaver/google-cloud-python,tswast/google-cloud-python,dhermes/google-cloud-python,dhermes/gcloud-python,googleapis/google-cloud-python,tseaver/google-cloud-python,tseaver/google-cloud-python,tswast/google-cloud-python,GoogleCloudPlatform/gcloud-python,googleapis/google-cloud-python,dhermes/google-cloud-python,dhermes/google-cloud-python,dhermes/gcloud-python,tswast/google-cloud-python,GoogleCloudPlatform/gcloud-python