Since the dawn of time we've labored under the crippling burden of
needing to explicitly request a version via configuration in order to
get a usable handle to the cloud. This is despite the hilarity of the
existence of a system for discovering available versions since basically
the beginning of the entire OpenStack project.

Today we shall be liberated from the tyranny of terrible past life
decisions on the part of our forefathers and shall usher forth the
shining freedom of actually using the discovery system.

Change-Id: I11c16d37d3ab3d77bed3a0bcbd98f1fa33b9555f