Add travis support

Remove realpath as Travis doesn't have it
Use bash instead of sh for build + test

Signed-off-by: Andy Goldstein <andy.goldstein@gmail.com>
(cherry picked from commit 1af01e28ef)

hack/test.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Copyright 2016 The Kubernetes Authors.
 #