Takashi Kajinami 1c52d9b959 Remove usage of deleted manifest_dir
Recent update in rspec-puppet removed some of the config interfaces for
old puppet versions[1]. This drops usage of these interfaces to resolve
the following error in unit tests.

```
An error occurred while loading ./spec/unit/provider/manila_spec.rb.
Failure/Error: c.manifest_dir = File.join(fixture_path, 'manifests')

NoMethodError:
  undefined method `manifest_dir='...
```

[1] 316d95923c

Change-Id: If34a187f1b54beeae2f4ac69e1df33be30f4b014
2023-10-11 12:11:13 +09:00
..
2023-03-22 23:59:07 +09:00
2022-07-15 11:57:01 +09:00
2020-08-31 22:05:10 +02:00