Updated openstack/openstack
Project: openstack-dev/devstack  871b1e47092a6463cb39be48c66bfe3e646920c2
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Update stack.sh to use openstackclient commands

There were a few instances of keystoneclient still being used,
these were replaced with their openstackclient equivalent.

Change-Id: I47fb7cf949b9ab054b97ae387ecbc6d7070fa9c3