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>

lib/https.js

@@ -34,6 +34,12 @@ const { urlToOptions, searchParamsSymbol } = require('internal/url');
 function Server(opts, requestListener) {
   if (!(this instanceof Server)) return new Server(opts, requestListener);
 
+  if (typeof opts === 'function') {
+    requestListener = opts;
+    opts = undefined;
+  }
+  opts = util._extend({}, opts);
+
   if (process.features.tls_npn && !opts.NPNProtocols) {
     opts.NPNProtocols = ['http/1.1', 'http/1.0'];
   }