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Fail tests that finish with pending assertions

`t.throws()` and `t.notThrows()` can be called with an observable or
promise. This commit forces users to wait for the assertion to complete
before finishing the test. Usually this means the test has to be written
like:

```js
test(async t => {
  await t.throws(Promise.reject(new Error()))
})
```

Or for callback tests:

```js
test.cb(t => {
  t.throws(Promise.reject(new Error())).then(t.end)
})
```

This simplifies internal logic and helps discourage code like in #1327.
Anecdotally users are surprised by the previous behavior where a
synchronous test worked with an asynchronous assertion
(https://github.com/avajs/ava/issues/1327#issuecomment-291122432).

Fixes #1327.

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