Re: [Libvir] PATCH: 15/16: stub test driver

This just stubs out an empty no-op storage driver impl for the test driver. This is basically to prevent the ensure the test suite does not try to contact the daemon for storage APIs, which would cause tests to fail. This needs to be extended to provide a fully-fledged test impl of the storage APIs in the future. It is intended that the test driver be able to leverage the XML parsing & formatting code from the storage_conf.{c,h} files, allowing greater code re-use across the dummy test and real storage drivers.