[infra-tests] Don't use env lists in .travis.yml except for secure (#5186)

This follows the recommendation of Travis CI, and is necessary for `allow_failures` to work (whether by design or bug is currently an open issue there).

Sadly, this is all in email with Travis CI support currently, and the docs are misleading. Yay! :\

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5186

Received on Tuesday, 21 March 2017 12:37:39 UTC