Get the test to fail even if coverage is good

[Lukasa]

Currently it seems that the CI tests pass even if tests fail, so long as coverage is met. That's dumb.

[Lukasa]

Hrm, I'm not sure I want to do this. @tatsuhiro-t, do you have any good insight into why nghttp2 isn't installing properly anymore? It used to work, and then I discovered it stopped working a while ago. See, for example, this test.

If none of @python-hyper/contributors or @tatsuhiro-t have time to work this out, I'll go ahead and merge this PR, which basically just removes nghttp2 support. I certainly don't have the time to dive into this at this time, and I'd rather get everything cleaned up than wait forever for someone to fix this up, but I'm prepared to wait a few days to give people time. It'd be nice to keep (and indeed improve!) the nghttp2 integration.

[tatsuhiro-t]

Do you make sure that shared library of nghttp2 python library is installed somewhere you expected?

[Lukasa]

@tatsuhiro-t I believe I do, but it's possible that that's not been done correctly now that I think about it. Let me investigate a bit.

[tatsuhiro-t]

I setup docker, and boot up ubuntu 16.04, installed required packages (cython from official ubuntu package), and run make install nghttp2 to default location (/usr/local/).
After ldconfig, I can import nghttp2 from python interactive terminal.

[Lukasa]

Yeah, so the issue with that on Travis is that we end up using a Python virtual environment, so we need to be careful with how the install runs.

[Lukasa]

I think at this point it's not really practicable to keep this patch out of tree. We'll need to add a task item to re-add nghttp2 support.