'users': (optional) list of users to be inserted, each item is a dict with:
'name': (mandatory) user name,
'key-pairs': (optional) list of strings with the public key to be inserted to the user
- 'user-data': (optional) string is a text script to be passed directly to cloud-init
+ 'user-data': (optional) can be a string with the text script to be passed directly to cloud-init,
+ or a list of strings, each one contains a script to be passed, usually with a MIMEmultipart file
'config-files': (optional). List of files to be transferred. Each item is a dict with:
'dest': (mandatory) string with the destination absolute path
'encoding': (optional, by default text). Can be one of: