test: flaky `test-net-can-reset-timeout`

* **Version**: `master`
* **Platform**: freeBSD
* **Subsystem**: test,net,stream


https://ci.nodejs.org/job/node-test-commit-freebsd/10321/nodes=freebsd10-64/
```
not ok 820 parallel/test-net-can-reset-timeout
  ---
  duration_ms: 2.482
  severity: fail
  stack: |-
    timeout
    timeout
    server side end
    client side end
    Mismatched <anonymous> function calls. Expected exactly 1, actual 2.
        at Object.exports.mustCall (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd10-64/test/common/index.js:481:10)
        at Server.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd10-64/test/parallel/test-net-can-reset-timeout.js:31:31)
        at Server.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd10-64/test/common/index.js:513:15)
        at emitOne (events.js:115:13)
        at Server.emit (events.js:210:7)
        at TCP.onconnection (net.js:1553:8)
  ...
```

The test:
```js
'use strict';
const common = require('../common');
const net = require('net');

const server = net.createServer(common.mustCall(function(stream) {
  stream.setTimeout(100);

  stream.resume();

  stream.on('timeout', common.mustCall(function() {
    console.log('timeout');
    // try to reset the timeout.
    stream.write('WHAT.');
  }));

  stream.on('end', function() {
    console.log('server side end');
    stream.end();
  });
}));

server.listen(0, function() {
  const c = net.createConnection(this.address().port);

  c.on('data', function() {
    c.end();
  });

  c.on('end', function() {
    console.log('client side end');
    server.close();
  });
});
```

/cc @nodejs/testing @nodejs/platform-freebsd @nodejs/streams 

P.S. to whomever tackles this, could you add a comment explaining what this is testing a la [doc/guides/writing-tests.md](https://github.com/nodejs/node/blob/master/doc/guides/writing-tests.md#lines-4-5)

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test: flaky `test-net-can-reset-timeout` #14241