Make security_groups_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 security_groups_client use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: I54792d5f80291b5bdd2f7896e08ac741597c1877
14 files changed