Template Names can contain / 's in the name, breaking the ability to save to disk

[evolve-rstroup]

Since backups of templates are saved as their template name, it can break the ability to save if the template has a / in the name.

I personally worked around this by setting outfile to a hardcoded value, but it would likely make sense to specify the filename with an argument.
Sorry i don't know python or I'd add a pull request.

template.py
out_file = "%s.json" % old_configuration.get("cn")