Set ansible_python_interpreter to python3

test-driver

@@ -39,7 +39,7 @@ wait_for_vms() {
     local ok=1
     while [ $i -lt 10 ]; do
         sleep 3
-        if ansible -v -i config.yml all -m ping; then
+        if ansible -e ansible_python_interpreter=/usr/bin/python3 -v -i config.yml all -m ping; then
             ok=0
             break
         fi