test-http-regr-gh-2928 is flakey in parallel runs

[jbergstroem]

Times out when running the test suite in -J on a limit set of slaves. Example: https://ci.nodejs.org/job/node-test-commit-plinux/nodes=ppcbe-fedora20/ws/test.tap/*view*/

[Trott]

@jbergstroem That link doesn't seem to be to a failure. Here's the failure you are looking for, I think: https://ci.nodejs.org/job/node-test-commit-plinux/nodes=ppcbe-fedora20/765/tapTestReport/test.tap-765/

Just looking briefly at that test, it may just need to be moved to sequential. It may just be too resource intensive to be reliably run with other tests. (But that was a quick look only so I could be wrong...)

[Trott]

Probable fix: #4615

[Trott]

I believe #4615 fixed this one too. Please re-open if I'm wrong.