Adds console script entry point

A Swift client executable needs to be provided on Windows since Python scripts
cannot be executed directly.

This approach is also consistent with other OpenStack Python clients (e.g.
Nova, Neutron, Cinder, etc.).

Change-Id: I7f03b7c305dceed4fa6f4fe1c1281659820606e4
Closes-Bug: #1359360
Merge "Adds console script entry point"