Updated openstack/openstack
Project: openstack/python-novaclient  f488e9e1c9b2c270acf9fef93ad08ce640fd579d
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Update broken command line reference link

The old reference link of nova command line was broken, update it
with latest one.

Change-Id: I4ab8a4750c7090ba20def6e47d1c4fe905a8256d