* Take options as well as requestListener

Unit-http have not kept up with the signature of nodejs's http package
development. Nodejs allows an optional `options` object to be passed to
the `createServer` function, we didn't. This resulted in function
signature errors when user code that did make use of the options arg
tried to call unit's replaced function.

This change changes the signature to be more in line with how nodejs
does it discarding it and printing a message to stdout.

* Add test file to start node application with options

* Add changes to docs/changes.xml

Closes: https://github.com/nginx/unit/issues/1043

This closes #1006 issue on GitHub.

Reviewed-by: Andrew Clayton <a.clayton@nginx.com>

After the launch of the project, the testing infrastructure was shared with
nginx project in some cases.  To avoid port overlap, a decision was made
to shift the port range for Unit tests.  This problem was resolved a long time
ago and is no longer relevant, so it is now safe to use port 8XXX range as the
default, as it is more appropriate for testing purposes.

Starting from Node.js 15.0.0 the chunk parameter of the response.write()
can be a Uint8Array.

This closes #870 issue on GitHub.

Also added stubs for Server.address()
This was done to prevent crashes in some popular frameworks like express

Supports both CommonJS and the new ES Modules system syntax e.g:

app.js:
const http = require('http')

app.mjs:
import http from "http"

Usage on Node 14.16.x and higher:
{
    "type": "external",
    "processes": {"spare": 0},
    "working_directory": '/project',
    "executable": "/usr/bin/env",
    "arguments": [
        "node",
        "--loader",
        "unit-http/require_shim.mjs"
        "--require",
        "unit-http/require_shim",
        "app.js"
    ]
}

Usage on Node 14.15.x and lower:
{
    "type": "external",
    "processes": {"spare": 0},
    "working_directory": '/project',
    "executable": "/usr/bin/env",
    "arguments": [
        "node",
        "--require",
        "unit-http/require_shim",
        "app.js"
    ]
}

In Node.js version 11.10.0 and later, the writeHead() function returns "this".

Added res.end() call in application and response status check.
Also, renamed to test_node_application_write_before_write_head.