Remove deprecated 'version' argument from call to ArgumentParser()

[Cyril Roelandt]

The 'version' parameter of argparse.ArgumentParser() is deprecated. In Python 2.7 argparse is part of the standard library, and the 'version' parameter can be safely omitted. In Python 2.6, it's a third-party library, and this parameter is also optional, its default value is 'None'. In Python 3, argparse is part of the standard library but the 'version' parameter does not exist and using it causes a failure in the test suite.

Removing this parameter does not change the behaviour of the code.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/74168
Committed: https://git.openstack.org/cgit/openstack/python-glanceclient/commit/?id=ecf2868fb3bd3374d196b28fedfa0fb94f5757f4
Submitter: Jenkins
Branch: master

commit ecf2868fb3bd3374d196b28fedfa0fb94f5757f4
Author: Cyril Roelandt <email address hidden>
Date: Mon Feb 17 22:32:19 2014 +0100

    test_shell: remove a deprecated keyword argument

    The 'version' keyword argument of argparse.ArgumentParser is deprecated. It was
    set to 'None' anyway, so just remove it.

    Closes-Bug: #1281856
    Change-Id: I6e5af0d90e9b1e7a6a60d5183c13299101148442