Updated openstack/openstack
Project: openstack/python-openstackclient  facdc8704e1bc552937657466529e41bc1b4120d
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Bring RESTApi closer to ithe imminent keystoneclient.Session

Prepare to use the (soon to be) common Session from keystoneclient
* Rework RESTApi to eventually be a subclass of keystoneclient.Session

Change-Id: I68e610f8b19a3f6267a93f7bf3de54a228be68aa