test: new test

New test adds /bin/fail.sh to verify that a failing pre:script (that
also takes too long to run) is detected: exit code and timeout.

Ensure existing test pass full path to /sbin/fail.sh script.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/skel/bin/fail.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+sleep 2
+exit 42