Make server action methods[a-c] 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 server action methods[a-c] use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: I62deef121ef74152474976d5619ed1bbb0e051b2
7 files changed