Update python-keystoneclient

Switching to v0.11.1 allows the use of authentication plugins in
other client libraries.

Change-Id: Idb99359b9faf3a77839662c2cbd8faf550137530
Co-Authored-By: Florent Flament <florent.flament-ext@cloudwatt.com>
Merge "Update python-keystoneclient"