Make identity v2 service_client use **kwargs

As we discussed on
http://lists.openstack.org/pipermail/openstack-dev/2015-July/068864.html
All http POST/PUT methods need to contain **kwargs as their arguments.
This patch makes identity v2 service_client use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: Ib5677cc185ace03f2e8824ba84365476823f50d5
3 files changed