url: improve descriptiveness of identifier

Change variable for protocols that do not always contain `//` to
`noLeadingSlashes` so someone reading the code knows what it means.

PR-URL: https://github.com/nodejs/node/pull/12579
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/url.js

@@ -765,14 +765,14 @@ Url.prototype.resolveObject = function resolveObject(relative) {
   var removeAllDots = mustEndAbs;
   var srcPath = result.pathname && result.pathname.split('/') || [];
   var relPath = relative.pathname && relative.pathname.split('/') || [];
-  var psychotic = result.protocol && !slashedProtocol[result.protocol];
+  var noLeadingSlashes = result.protocol && !slashedProtocol[result.protocol];
 
   // if the url is a non-slashed url, then relative
   // links like ../.. should be able
   // to crawl up to the hostname, as well.  This is strange.
   // result.protocol has already been set by now.
   // Later on, put the first path part into the host field.
-  if (psychotic) {
+  if (noLeadingSlashes) {
     result.hostname = '';
     result.port = null;
     if (result.host) {
@@ -820,7 +820,7 @@ Url.prototype.resolveObject = function resolveObject(relative) {
     // just pull out the search.
     // like href='?foo'.
     // Put this after the other two cases because it simplifies the booleans
-    if (psychotic) {
+    if (noLeadingSlashes) {
       result.hostname = result.host = srcPath.shift();
       //occasionally the auth can get stuck only in host
       //this especially happens in cases like
@@ -901,7 +901,7 @@ Url.prototype.resolveObject = function resolveObject(relative) {
       (srcPath[0] && srcPath[0].charAt(0) === '/');
 
   // put the host back
-  if (psychotic) {
+  if (noLeadingSlashes) {
     result.hostname = result.host = isAbsolute ? '' :
                                     srcPath.length ? srcPath.shift() : '';
     //occasionally the auth can get stuck only in host