conpaas: TextTestRunner always exits with 0 status (conpaas-services/src/tests)

Explicitly check for unsuccessful test results and exit with a non-zero status
where appropriate.


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5190 ef35cc4a-2640-4bbf-98bc-65920db7d8ae