Ha, yes, this change should be done in future. But now, we should keep it what it was. The reason is when someone is using the new tp-libvirt but a old virttest, this change will break it. It means if the caller of libvirtd is in virttest, we can update it with class Libvirtd safely, as we have it already. But if the caller is in tp-libvirt, we are waiting for the all users updated their virttest. That's why we should keep the deprecated functions in utils_libvirtd. I talked with lmr for this problem, and we did not get a good solution for it. 

Anyway, we should keep the libvirtd_is_running() here.