let's not use the deprecated argument

[Dave Chen]

commandline for the user show us the optional argument is '--project', acutally, '--project' is deprected in the keystoneclient.
It's better to show the latest argument instead of deprectaed argument.

[Dave Chen (wei-d-chen)]

This can only happen when I tried to set some user information.
> openstack user set bc023e507f3d46cda402511f6ef34876 --project 658bbe3777ec458b94eb0e697bf1e794WARNING: keystoneclient.v3.users The project argument is deprecated, use default_project instead.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/188804

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/188804
Committed: https://git.openstack.org/cgit/openstack/python-openstackclient/commit/?id=7cf779004e5e9eab9abee8d8a5bc2db3dfa8bd5d
Submitter: Jenkins
Branch: master

commit 7cf779004e5e9eab9abee8d8a5bc2db3dfa8bd5d
Author: Dave Chen <email address hidden>
Date: Fri Jun 5 22:43:08 2015 +0800

    Not use the deprecated argument

    `project` argument is deprecated in keystoneclient for V3 API,
    and use `default_project` instead, should use `default_project`
    as the argument name in the openstackclient accordingly.

    Change-Id: Ib9d70801c933a184afcdab75204393efa764fa87
    Closes-Bug: #1462389