Author: Giulio Fidente
Revision Date: 2016-05-18 22:34:00 UTC

Ensure temporary 'hosts' file used for testing is deleted via addCleanup

While tearDown is not executed in case of errors raised during the setUp
phase while addCleanup is; this change updates test_util.py so that the
temporary 'hosts' file created to run some unit tests is deleted in
addCleanup instead of tearDown.