Investigate flaky test test-net-connect-timeout

[joaocgreis]

Examples of failures:

• win2008r2
• win2012r2
• centos5-32
• centos5-64
• fedora21
• ubuntu1504-64

[Trott]

I believe #2257 would make this not-flaky.

EDIT: Although I suppose if internet tests are being run in CI, there's no need to move it to parallel the way that PR does. But that's an easy enough change I can make to it...

[Trott]

I believe this is fixed in #2257 / ae8d436

Guess we'll find out for sure after #2424 lands.

Closing because I think that's the right thing to do in this situation, but I don't feel strongly about that, so you know, re-open if you want it to stay open for a while.