Make volume volume_client to use **kwargs-part2

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 volume_client use **kwargs for all remaining
methods.

Partially implements blueprint consistent-service-method-names

Change-Id: I7d65b18fb9f642d7b78b6474eb922c3382daab3e
7 files changed