Updated openstack/openstack
Project: openstack/ceilometer  46abfc51e5b0245d344ce8d585067243f7232cf0
null
Made get_capabilities a classmethod instead of object method

Capabilities are the same for all objects so there is no need for them
to be nonstatic. Another benefit is that we can check capabilities of
the Connection without the need to create an object and open real
connection.

Change-Id: Ie9314cb49b4c2bffb2bae4d5eeca6f5d8e2637ce