Set libvirt_type to qemu if using virt

Change-Id: Ib5e6d031c97b578ea4b29c94d9f6e0f0908918b0
Finish devtest story

Start and ping a VM on the overcloud

Change-Id: Iba5d8eccc035702e3b6976b2f861786d70d30cc5
Merge "Set libvirt_type to qemu if using virt"
Merge "Finish devtest story"