Replace six.iteritems() with .items()

Registered by WangBinbin

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 be 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

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Drafter:
WangBinbin
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Assignee:
WangBinbin
Definition:
Obsolete
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Completed by
WangBinbin

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