pool-wizard virtual mode does not query guest's address properly

[jtluka]

Wizard uses libvirt's DHCPLeases() method to check if the lease table contains guest libvirt domain name. Unfortunately the hostname keys is not the libvirt guests' name but really a hostname. So unless a user has a mapping in /etc/hosts the current approach won't work and the hostname contains 'None'.

I have already fix for this and will post this soon.