https: make opts optional & immutable when create

`opts` in `createServer` will be immutable that won't change origional
opts value. What's more, it's optional which can make `requestListener`
be the first argument.

PR-URL: https://github.com/nodejs/node/pull/13599
Fixes: https://github.com/nodejs/node/issues/13584
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

doc/api/https.md

@@ -46,7 +46,7 @@ added: v8.0.0
 
 See [`http.Server#keepAliveTimeout`][].
 
-## https.createServer(options[, requestListener])
+## https.createServer([options][, requestListener])
 <!-- YAML
 added: v0.3.4
 -->