zhu.rong 50f206d22c remove default=None for config options
In the cfg module default=None is set as the default value.
It's not necessary to set it again when defining config options.

Change-Id: I1da2192df37b7e460e63bb59cd7d691aa9be00f4
Closes-bug: #1323975
2015-11-03 10:55:51 -05:00
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