Updated openstack/openstack
Project: openstack/requirements  2cdc9e50c1dcc8292468e3d118b4a3f98b58a400
null
Add cmd2 for cliff

cliff was recently adopted by the Oslo project, so its
requirements now need to be included explicitly in the
global requirements list so they are in the mirror for
jobs when cliff is installed from source.

Change-Id: Ie8f9376dea2102c77a3310fe9adf56074c6fe25f