Update PlaybookRunner behaviour

[jan-zmeskal]

SInce introduction of upload_playbook parameter to PlaybookRunner.run() method, we allow the users to upload the target playbook on their own to a remote resources. However, vars_files and vault_password_file parameters still require local paths and still upload local files to a remote host. We need to change PlaybookRunner.run() interface so that either

• all provided paths are local and all the files get uploaded to a remote host automatically or
• all provided paths are remote and it's up to the user to get those files to a remote resources

This should be driven by the value passed to upload_playbook parameter. For more context, see my conversation with Lukas here: https://github.com/rhevm-qe-automation/python-rrmngmnt/pull/129/files#r422892028