Change CLIAuth arg names
Change CLIAuth arg names

Change the argument names used for common Keystone authentication per the
updated http://wiki.openstack.org/CLIAuth:

--auth_url -> --os_auth_url
--password -> --os_password
--username -> --os_username

Fixes bug 954528

Change-Id: I7e956e74de8192957eee87d155b2e5338c8942f0

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