test: rename test-regress-nodejsGH-877.js

Rename the test appropriately alongside mentioning the subsystem
Also, make a few basic changes to make sure the test conforms
to the standard test structure

Refs: nodejs#19105
Refs: https://github.com/nodejs/node/blob/master/doc/guides/writing-tests.md#test-structure

Author: ryzokuken

test/sequential/test-regress-GH-877.js renamed to test/sequential/test-http-max-sockets.js

@@ -21,6 +21,10 @@
 
 'use strict';
 const common = require('../common');
+
+// Make sure http server doesn't wait for socket pool to establish connections
+// https://github.com/nodejs/node-v0.x-archive/issues/877
+
 const http = require('http');
 const assert = require('assert');