Add capability for user to specify arbitrary version path

[Terry Howe]

The user should be able to have a user preference version preference to select a version module *and* the ability to select an arbitrary version path so they can access features the sdk may not know about. For instance if they wanted to access some network 2.1 API. They would specify some cli option like --os-api-version-path network=v2.1 This value would be used with the endpoint url from the service catalog to access the service. Instead of the v2.0 path, it would use the v2.1 path.

[Terry Howe (thowe-g)]

Right now, the --os-api-version option in the examples will allow something like a v2.1 path, but there is no fuzzy logic to match v2.1 to v2. Also, perhaps the --os-api-version-path option would allow more flexibility to the user if path should be something totally different than the version. For example v2 matches no version in the path or v2 matches 'two' in the path.