qemu.py: Clean up scratch space in separate thread to allow quicker creation times, especially when creating many VMs
qemu.py: Clean up scratch space in separate thread to allow quicker creation times, especially when creating many VMs


git-svn-id: bf82309ee31681273af20a825c7064ea7c5af838@1104602 13f79535-47bb-0310-9956-ffa450edef68

stroucki/tashi,stroucki/tashi,stroucki/tashi