Updated openstack/openstack
Project: openstack/python-novaclient  873c55470e655da269e5db8dae970aa78eb0d55f

Edits on help strings

Improve help strings for consistency. Fix wording, typos,
capitalization and add "." as appropriate.

Change-Id: I376f6d0269aee8dd0e67ffab6386eac2139844ab