Updated openstack/openstack
Project: openstack/python-keystoneclient  8657da11af4100c67969c5ad256e084eee434b5e
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Python3: use six.moves.urllib.parse.quote instead of urllib.quote

This makes the code compatible with both python 2 and 3.

Change-Id: Ic1c5c8d4a85db138a8402ea4b3208828fc118a40