liuyamin 3ef34da36c Replace six.iteritems() with .items()
1.As mentioned in [1], we should avoid using six.iteritems to achieve iterators.
We can use dict.items instead, as it will return iterators in PY3 as well.
And dict.items/keys will more readable.
2.In py2, the performance about list should be negligible, see the link [2].

[1] https://wiki.openstack.org/wiki/Python3
[2] http://lists.openstack.org/pipermail/openstack-dev/2015-June/066391.html

Change-Id: If76115f706e9e100a1780471af0f9c5d92d3bc9f
2017-07-19 14:13:15 +08:00
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