Updated openstack/openstack
Project: openstack/python-swiftclient  2d15780a468d1894602333182d56589039bdb93a
null
Fix help of some optional arguments

Some positional arguments are optional but the help indicate
they are mendatory and can be confuse for an user.

  swift delete <container> [object]
  swift post <container> [object]

Change-Id: I7be525905b51d3ef160b0f47194e817b5cba0f9b