Aleksey Stepanenko 95db3971da
docs: update connection for the openstack provider (#6776)
The option `username` does not work. Need to use user_name with underscore

> Authentication failed: Exactly one of Username and UserID must be provided for password authentication

The option `user_name` works, however, it's need to use `region`, `domain_name` in additional.
2020-02-18 14:06:34 +01:00
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