Pass board to devserver for latest image.
Pass board to devserver for latest image.

Change-Id: I339e1ce3d8f73e15aa554e1111aced163819ec23

BUG=8732
TEST=Ran with other CL and using latest image.

Review URL: http://codereview.chromium.org/4527001

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