Comment 2 for bug 1553030

Reviewed: https://review.openstack.org/287666
Committed: https://git.openstack.org/cgit/openstack/python-swiftclient/commit/?id=17aa6c789e3c28e59be3b92e6fa65edb89077436
Submitter: Jenkins
Branch: master

commit 17aa6c789e3c28e59be3b92e6fa65edb89077436
Author: Tim Burke <email address hidden>
Date: Wed Mar 2 16:02:28 2016 +0000

    Port from optparse to argparse

    Why now?

    * argparse was introduced in Python 3.2 and back-ported to Python 2.7.
      Until we dropped Python 2.6 support, we were stuck on optparse.

    * keystoneauth.loading.cli provides register_argparse_arguments and
      load_from_argparse_arguments helper methods. Now that we're moving
      toward Keystone Session support, argparse seems required.

    Closes-Bug: 1553030
    Change-Id: I5139fb64a8631a3010680090fd04345f95c55c7b