[libvirt] Modified version of the libvirt-test-api wrapper

Hi Guannan: I've worked on your first version of the libvirt-test-api wrapper for autotest. Could you please check if you like the modified version? https://github.com/autotest/autotest/pull/230 If you do think it's fine, you can ack it, or you might take it, modify and resend it. On a git branch, you can do the following: curl https://github.com/autotest/autotest/pull/230.patch | git am And then modify and resend. Cheers, Lucas