Make v1 list_images use **kwargs & doc string update

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 list_images of v1 image_client use **kwargs.
Also update doc string for the same.

Partially implements blueprint consistent-service-method-names

Change-Id: Ic603ef5d265fdea345bd4ca8d2c18a6f8bafb657
1 file changed