Clean up any previous kvm state.
Clean up any previous kvm state.

Change-Id: I01fecde5e687992ccf36889803a4cb84b71a38b2

BUG=7818
TEST=Ran with/without previous kvm instance

Review URL: http://codereview.chromium.org/3760012

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