The Travis container based envs are deprecated:

  https://docs.travis-ci.com/user/reference/trusty/



  "Container-based infrastructure is currently being deprecated.
   Please remove any sudo: false keys in your .travis.yml file
   to use the default fully-virtualized Linux infrastructure
   instead."

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>