The .coveragerc file was pointing to the keystoneauth directory which no
longer exists. Update this to keystoneauth1.
Also remove the keystoneauth/openstack directory. This doesn't exist as
we don't have anything from oslo.incubator.
This is the suggested location for tests and is adopted by most
projects. As part of this change relative imports to package imports.
Fix all the test running and coverage code to point to the new location.