CLOUDSTACK-2729: use spd.getTargetPath instead of mount path to fix issue on local storage
(cherry picked from commit b2ed632396fb57fedd7f88d36408299167f963c0)
Add cpu model for kvm guest.Now all the kvm guest's cpu model is 'QEMU Virtual CPU version xxx'. This will affect the activation of Windows OS and low performance. I add three mode for user to indicate the guest cpu model.add libvirt version check

Signed-off-by: Wei Zhou <w.zhou@leaseweb.com>
(cherry picked from commit 2903bb5fd9d59803980102854d11e33ebe56088b)