Actually die if a parallel test fails.
Actually die if a parallel test fails.

Change-Id: I24b498fffb7e7ce54517945730c91fecd1d57586

BUG=chromium-os:10723
TEST=Ran it and killed a test

Review URL: http://codereview.chromium.org/6260023

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