Use new Travis CI infrastructure

[TimothyGu]

Travis CI just said they are going to deprecate sudo: false in a pretty fast timeline: https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration

We should make sure we are prepared for that change.

/cc @nodejs/build

[Trott]

No time like the present...

#24511

[richardlau]

Travis CI just said they are going to deprecate sudo: false in a pretty fast timeline: https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration

We should make sure we are prepared for that change.

/cc @nodejs/build

This was communicated back in the beginning of October (as noted in #22589 (comment)).

[refack]

This was communicated back in the beginning of October (as noted in #22589 (comment)).

Ack. But new blog urges us to rush:

... You may have seen a blog post about this several weeks ago. Today, we want to provide an update on what’s currently happening and what to expect next.

While the migration process is already underway, we’re fast approaching the milestone when the container-based sudo: false environment will no longer be available....