Bump keystoneclient to 0.10

Bump global requirements to the latest version of keystoneclient.

There are changes in the most recent version that are required to 
handle v3 authentication from keystonemiddleware, as well as 
updates to how clients consume the keystoneclient session objects.

Change-Id: I2998e790562c02693f95d885aab272a948c31822
Merge "Bump keystoneclient to 0.10"