perf-kvm,  virt-win-reg,  pci-passthrough

virt-win-reg: 'verify_reg_cmd' uses right registry entry now.
pci-passthrough: missing default value for params.get("libvirt_pci_server_ip").
per-kvm: branch conditions in "if top:" and "if report:".
Okey this problem was already fixed at *Tue Aug 26 16:24:59 2014* by b8c7776a99056208f12583d0e89dce59323f817b. Shame on me, I forgot this patch from myself. Therefore, this patch in your PR should be dropped now.