Make volume_types_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 volume_types_client use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: I51d02186fae7165c905b031f16c6682b5edf0a55
8 files changed