fix(@angular-devkit/build-angular): don't add publicHost pathname to sockPath in dev-server

With this change we remove the unintentional breaking change that added publicHost pathname to sockPath instead we now prepend the sockPath with the servePath, which can be either the passed servePath option, baseHref or deployUrl.

(cherry picked from commit f122b2f)

Author: alan-agius4

packages/angular_devkit/build_angular/src/webpack/configs/dev-server.ts

@@ -48,7 +48,6 @@ export function getDevServerConfig(
   const extraPlugins = [];
 
   // Resolve public host and client address.
-  let sockPath: string | undefined;
   let publicHost = wco.buildOptions.publicHost;
   if (publicHost) {
     if (!/^\w+:\/\//.test(publicHost)) {
@@ -57,10 +56,6 @@ export function getDevServerConfig(
 
     const parsedHost = url.parse(publicHost);
     publicHost = parsedHost.host;
-
-    if (parsedHost.pathname) {
-      sockPath = posix.join(parsedHost.pathname, 'sockjs-node');
-    }
   }
 
   if (!watch) {
@@ -107,7 +102,7 @@ export function getDevServerConfig(
           },
         ],
       },
-      sockPath,
+      sockPath: posix.join(servePath, 'sockjs-node'),
       stats: false,
       compress: stylesOptimization || scriptsOptimization,
       watchOptions: getWatchOptions(poll),