Expose errors from godep_restored to caller

Otherwise, if the function crashes, the user doesn't see the reason why
it happened.

hack/godep-restore.sh

@@ -23,7 +23,7 @@ source "${KUBE_ROOT}/hack/lib/init.sh"
 
 kube::log::status "Restoring kubernetes godeps"
 
-if kube::util::godep_restored >/dev/null 2>&1; then
+if kube::util::godep_restored 2>&1; then
     kube::log::status "Dependencies appear to be current - skipping download"
     exit 0
 fi