Nocks behavior around events and errors relating to aborting and ending requests has not lined up
with Node for while. I dug into an investigation of how it differs, if there were git commits/pull-requests explaining why they differ,
and trying to answer the question of should Nock change to line up better.

The single largest deviation were the errors emitted around aborting or already aborted requests.
Emitting an error on abort was added to fix issue nock#439.
The conversation talks about how Node emits an error post abort.
> ... in practice the `http` module does emit an `ECONNRESET` error after aborting. ... - Jan 7, 2016

However, this is only true between the 'socket' and 'response' events.
Otherwise calling abort does not emit an error of any kind.

Determining exactly what Nock should do is a bit of moving target.
As Node's internals of HTTP, Net, Stream, and micro task timing have changed a lot since
iojs/v4, when Nock added these errors, and v13, current at this time.

My conclusion is that none of Nock's deviations from Node's _documented_ behavior
are user features that should be maintained. If anything, bringing Nock closer to Node
better fulfills original requests.
nock#282

The entire `test_abort.js` file was scraped and rewritten by writing assertions against Node behavior, without Nock first.
Then adding Nock into each test to ensure events and errors were correct.

BREAKING CHANGE:

Calling `request.abort()`:
- Use to always emit a 'socket hang up' error. Now only emits the error if `abort` is called between the 'socket' and 'response' events.
- The emitted 'abort' event now happens on `nextTick`.
- The socket is now only destroyed if the 'socket' event has fired, and now emits a 'close' event on `nextTick` that propagates though the request object.
- `request.aborted` attribute is set to `true` instead of a timestamp. Changed in Node v11.0 nodejs/node#20230

Calling `write`, `end`, or `flushHeaders` on an aborted request no longer emits an error.
However, writing to a request that is already finished (ended) will emit a 'write after end' error.

Playback of a mocked responses will now never happen until the 'socket' event is emitted.
The 'socket' event is still artificially set to emit on `nextTick` when a ClientRequest is created.
This means in the following code the Scope will never be done because at least one tick needs
to happen before any matched Interceptor is considered consumed.
```js
const scope = nock(...).get('/').reply()
const req = http.get(...)
scope.done()
```