Updated openstack/openstack
Project: openstack-dev/devstack  c8dcb2fd5e2c51a96ab840523bfc59c521aea287
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Add cliff, pycadf, stevedore, & taskflow from oslo

Oslo has adopted 4 libraries that were previously on
stackforge, so we can now install them from source.

Change-Id: I6b6e20a7884b47ade466fc38641a5ac1a5f3e146