Add k8sbeta-autoscaling job to sig-autoscaling testgrid
Add k8sbeta-autoscaling job to sig-autoscaling testgrid

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid