Make create_server 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 create_server use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: I4b9effc2c68f6a5336eee249ff76686aca8a8480
19 files changed