test: deflake test-http-regr-nodejsgh-2928

Hard code the value of the host parameter to `common.localhostIPv4` in
`server.listen()` and `net.connect()`. This

1. ensures that the client `socket._handle` is not reinitialized during
   connection due to the family autodetection algorithm, preventing
   `parser.consume()` from being called with an invalid `socket._handle`
   parameter.
2. works around an issue in the FreeBSD 12 machine where the stress test
   is run where some sockets get stuck after connection.

Closes: nodejs#49565
Fixes: nodejs#49564

test/sequential/test-http-regr-gh-2928.js

@@ -39,7 +39,9 @@ function execAndClose() {
     throw e;
   });
 
-  parser.consume(socket._handle);
+  socket.on('connect', function() {
+    parser.consume(socket._handle);
+  });
 
   parser.onIncoming = function onIncoming() {
     process.stdout.write('+');