Enable usage of the Trusty beta on Travis

[aneeshusa]

Travis now has new Trusty based instances in Beta. They offer much
faster boot times, twice as much memory, and a more reliable core count.

[aneeshusa]

Also see http://docs.travis-ci.com/user/ci-environment/#Virtualization-environments for a summary of the differences between the standard (Precise) and beta (Trusty) environments.

[Manishearth]

@bors-servo r+

Should we be turning this on for other repos that require sudo?

[bors-servo]

📌 Commit a2d4f50 has been approved by Manishearth

[bors-servo]

⌛ Testing commit a2d4f50 with merge 81e7ec8...

[Manishearth]

We also have Trusty on our linux boxes so this works out well!

[aneeshusa]

Which other repos? I was looking through the Travis docs (actually looking into #142) and noticed they now have a beta for Trusty environments. There only seem to be advantages to switching, so I'd recommend yes after testing to make sure it doesn't cause any regressions.

[aneeshusa]

Ooh, the increased parity also sounds like a good idea, +1 for keeping all environments in sync as much as possible.

[Manishearth]

Well, sudo: false is still faster than the Trusty thing right now.

The repos that need sudo: required are actually using sudo: 9000, which is a whole different thing and probably won't work with this Trusty stuff.

[bors-servo]

☀️ Test successful - travis

[aneeshusa]

Yeah, the significantly faster speed of the container infrastructure makes sense for anything that doesn't need sudo.

What's sudo:9000? A quick search seems to say it's Ubuntu 14.04 on GCE, which AFAICT is the same as the Trusty beta.

[Manishearth]

Unpublicized faster builds on GCE (experimental feature), not sure if it's exactly the same as trusty, @larsbergstrom would know.

[larsbergstrom]

They're the same thing.