jiahui.qiang 8e277c64fb Fix port command for SDK >0.9.10
The port functional test can not be passed in my local environment.
When 'dns_assignment' is None, the port create, show command will
fail because parameter for 'utils.format_list_of_dicts' can not be
None.

Change-Id: Iebf16fb7ca681660c2b9ee7839a0629f38c6a38a
2017-01-09 12:23:03 +08:00
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