[HEAD-622] usb-headnode build-image incorrectly uses build.spec as higher priority than build.spec.local (fix build)
[HEAD-622] usb-headnode build-image incorrectly uses build.spec as higher priority than build.spec.local (fix build)

kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,numericillustration/sdc-headnode