Fix the CI build

[sauloperez]

What we should change and why (this is tech debt)

The CI build is currently failing a crazy lot which slows us down and brings down our confidence on the tests.

Context

The only explanation that we found is that the recent upgrade to Ruby 2.2.10 made some of the already flaky tests totally unreliable.

Impact and timeline

This is totally affecting our delivery pipe and needs to be fixed ASAP.

[sigmundpetersen]

Maybe #3369 can be considered as part of this work? Improving spec reliability using timecop

[Matt-Yorkley]

I'm wondering if now is a good time to try out CircleCI? All these flaky specs pass locally and only fail in Semaphore, which is running Ubuntu 14. We might get a faster build, too...

[luisramos0]

🎉

[sauloperez]

If I'm not mistaken #4756 was the last missing piece.

[luisramos0]

there are few more but they dont break so often, embbeded_shopfront_spec for example.
this was a good team effort!