test: HTTP weirdness

[richardschneider]

First reported in #648

4) 'deal with HTTP weirdness' tests does not crash if no content-type header is provided:
     Uncaught AssertionError: expected [Error: read ECONNRESET] to not exist 
      at ipfsAPI.config.replace (test\request-api.spec.js:28:28)

This is just a work around and does not fix the underlying problem. I've changed the test to use id instead of config.replace and the test passes.

@diasdavid I'm think the ECONNRESET could be coming from push stream not being read by the server. But perhaps it something else. More eyeballs might help. I think it's more of a timing/race issue than a specific windows issue

[richardschneider]

Fixed it by consuming the entire request, before responding.

[daviddias]

Interesting, this looks like a Node.js issue and not a js-ipfs-api. Thanks @richardschneider