Config: no need to set default=None

By default oslo.cfg sets the default value as None. There is no
need to explicitly do this.

TrivialFix

Change-Id: I8d47b8815947c1c1e22e49822ffec0b8874d4487
1 file changed
tree: baba575f48cedba646b662891f04665ffe53f7a9
  1. common/
  2. functional/
  3. scenario/