Updated openstack/openstack
Project: openstack/python-keystoneclient  17abb7b915e58122ab741606483361569ba5fcf2
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Warn user about unsupported API version

Prints a warning when the user tries to use an unsupported API.
Also provides a test case to check it still does fall back to 2.0.

Change-Id: Idabd150f52d27a9d065cf570f6367459126f98be
Closes-bug: #1256987