Updated openstack/openstack
Project: openstack/python-keystoneclient  3a6d47c1540e9e5b75be064a2273eb52831192ec
null
Remove redundant default value None for dict.get

The default value for dict.get is None, no need to specify again.

Change-Id: I9f0204e59bd4c1642586bddfef0c75e0a7730925