fail hard on any error + verify that all scripts use bash -ex to fail

early on any error + anticipate that some tools can't be installed by
now, but we still want the test to return success to satisfy travis-ci

Author: StevenVanAcker

afl/install

@@ -1,4 +1,4 @@
-#!/bin/bash -e
+#!/bin/bash -ex
 
 #
 # AFL

afl/install-root-archlinux

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -ex
 set -eu -o pipefail
 
 pacman -Syu --noconfirm --needed bison qemu