improve travis build

Here we have a minor fix for the test suite and travis build script improvements.
Now after all the recent test fixes it starts to get useful.

So maybe you want to sign up https://travis-ci.org/
add your util-linux project and enable the travis hook in github->util-linux->settings
Should only take 5 minutes. Once it's set up it does not bother you except of writing you an email if you or somebody else brakes the build. It even checks pull requests automatically before you started thinking about merging it upstream :)