Updated openstack/openstack
Project: openstack/glance  9ac0c31608ceff5d8a3512c7449330cfe07d2687
null
fix bug:range() is not same in py3.x and py2.x

in python3.x, there is no method named xrange(),it
has replaced by range(),which is equal to xrange() in
python2.x. so we must fix this issue.we use six module
to fix this issue.

Change-Id: If4fd7478865e8024025af3e57e42f2a24e1e2bbc
Closes-Bug: #1268439