[libvirt] [PATCH] (not for inclusion) add virDomainRename API

The following patch stubs out virDomainRename() as an available API function. I'm just making sure I'm doing this right. I know there were some plans to include documentation about adding API to the website but I don't see it. The included patch does not include my example driver for qemu and test. Just looking for a thumbs up/down whether I should continue or not and whether I'm adding it right. -- Doug Goldstein