Luong Anh Tuan 4b1ac84e3f Remove default=None when set value in Config
By default oslo.cfg sets the default values as None [1], There is
no need to explicitly do this.

[1] https://github.com/openstack/oslo.config/blob/master/oslo_config/cfg.py#L829

Change-Id: I032f1044ab96b04f0ea1f66762a832c305280522
2016-09-28 00:37:41 +00:00
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