add --kvm-qemu-uri option into docs form kvm driver

#8296 Remove old python scripts

honor --image-repository even if --image-mirror-country is set

Update manual instructions for Parallels driver

docker driver: add fall back image in docker hub 

github actions: add clean up to master too

add clean up before running windows test

exit out of the soft start test if we can't find old config

Upgrade oldest k8s version supported to 1.13

bump default kubernetes version to 1.18.3

skip two always failing test on windows and create issue

Add Ambassador Ingress controller as an addon

Make sure multinode clusters can survive restarts