feat(vm_image_util): Support other disk formats with Xen, such as vhd.
feat(vm_image_util): Support other disk formats with Xen, such as vhd.

mjg59/scripts,andrejro/coreos--scripts,andrejro/coreos--scripts,sigma/coreos-scripts,smilart/scripts,mischief/scripts,fivethreeo/scripts,zhang0137/scripts,mjg59/scripts,marineam/coreos-scripts,crawford/scripts,mischief/scripts,zhang0137/scripts,glevand/coreos--scripts,vmware/coreos-scripts,vmware/coreos-scripts,zhang0137/scripts,trnubo/scripts,coreos/scripts,endocode/scripts,gtank/scripts,marineam/coreos-scripts,BugRoger/scripts,fivethreeo/scripts,nicescale/scripts,nicescale/scripts,marineam/coreos-scripts,glevand/coreos--scripts,fivethreeo/scripts,smilart/scripts,endocode/scripts,gtank/scripts,vmware/coreos-scripts,sigma/coreos-scripts,BugRoger/scripts,nicescale/scripts,smilart/scripts,endocode/scripts,andrejro/coreos--scripts,BugRoger/scripts,crawford/scripts,crawford/scripts,mischief/scripts,coreos/scripts,sigma/coreos-scripts,gtank/scripts,mjg59/scripts,trnubo/scripts,trnubo/scripts