Fix `.travis.yml` assertions
Fix `.travis.yml` assertions

The underlying blueprint was updated in the `beta` branch to use
`xenial` instead of `trusty`, then those changes were merged into
`master` branch. However, `master` branch had made some small changes to
these tests as well (adding a test for `ember new` without special
flags) that needed fixing also.

thoov/ember-cli,thoov/ember-cli,raycohen/ember-cli,ember-cli/ember-cli,balinterdi/ember-cli,buschtoens/ember-cli,kategengler/ember-cli,ember-cli/ember-cli,thoov/ember-cli,raycohen/ember-cli,kategengler/ember-cli,buschtoens/ember-cli,elwayman02/ember-cli,jrjohnson/ember-cli,elwayman02/ember-cli,balinterdi/ember-cli,asakusuma/ember-cli,ember-cli/ember-cli,asakusuma/ember-cli,thoov/ember-cli,jrjohnson/ember-cli