Update build script to fail on error.

build

@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 
 ETCD_PACKAGE=github.com/coreos/etcd
 export GOPATH="${PWD}"

test.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 
 # Get GOPATH, etc from build
 . ./build