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: Ib7ad61bac89e14561719434085b63cbad7e9a9be
Copy S3 server implmenetation and unit tests from Nova.
Add fileutils from oslo-incubator and refresh incubation modules.
Upgrade script doesn't copy buckets content because Nova S3 server
is not intended to be permanent full functionality object storage, but
has to be used temporary to CreateImage operation only.
Change-Id: I7d38b0a8e014dfff8238e7134d837d1074e4dd95