Add simple node test

tests/test-simple-node.yml

+---
+- hosts: localhost
+  connection: local
+  remote_user: root
+  tasks:
+  - name: Download paas-ci role
+    local_action: command ansible-galaxy install git+https://baltig.infn.it/antonacci/paas-ci.git
+    changed_when: false
+
+  - include_role:
+      name: paas-ci
+    vars:
+      paas_ci_test:
+        template_url: https://baltig.infn.it/infn-cloud/tosca-templates/-/raw/master/single-vm/single_vm.yaml
+        inputs: |
+          '{ "users": [{"os_user_add_to_sudoers": true, "os_user_name": "antonacci", "os_user_ssh_public_key": "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDE887DQ8WcX5f8d9/MakzMhG/QovKzjrgDzJ0CwjxKm3kUYildhPcUtj7k73WdcP06st6cWpxQ+7HmFseuX+1GASorENAqMHbOvoT0K6pkNlgwgyDOYdR5JSnXIEfR7gTE391SuYN8lbLEvFCscNHYP6814tYochO+sSlpa3XJ2nHvvVp4Ikt/X2Q+zidkKzuMUwFeGf4MZz93Nlwcbg3UM+ENEjjksb7Rqxx2WtYAv8Gn6Jr1X3PmvMoaO9HBgZaosp7NXh20LRHJW+aiEKcr+vzFlgUjTcd/h2CrkgS6+AhjKqpMNS1sS/QuOvPVMUNr1dSOkmAR5EwfHcXpY9RL marica@MacBook-Air-di-marica.local"}]}'