feat: allow username and password in clientURL

Author: anshumanv

test/server/__snapshots__/Server.test.js.snap.webpack4

@@ -4,7 +4,7 @@ exports[`Server DevServerPlugin add hot option 1`] = `
 Array [
   Array [
     "client",
-    "index.js?ws%3A%2F%2Flocalhost%3A8103%2Fws",
+    "index.js?ws%3A%2F%2Flocalhost%3A8104%2Fws",
   ],
   Array [
     "node_modules",
@@ -22,7 +22,7 @@ exports[`Server DevServerPlugin add hot-only option 1`] = `
 Array [
   Array [
     "client",
-    "index.js?ws%3A%2F%2Flocalhost%3A8103%2Fws",
+    "index.js?ws%3A%2F%2Flocalhost%3A8104%2Fws",
   ],
   Array [
     "node_modules",
@@ -40,7 +40,7 @@ exports[`Server DevServerPlugin should create and run server with old parameters
 Array [
   Array [
     "client",
-    "index.js?ws%3A%2F%2Flocalhost%3A8103%2Fws",
+    "index.js?ws%3A%2F%2Flocalhost%3A8104%2Fws",
   ],
   Array [
     "node_modules",

test/server/servers/__snapshots__/WebsocketServer.test.js.snap.webpack4

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`WebsocketServer should receive connection, send message, and close client 1`] = `"localhost:8129"`;
+exports[`WebsocketServer should receive connection, send message, and close client 1`] = `"localhost:8130"`;
 
 exports[`WebsocketServer should receive connection, send message, and close client 2`] = `
 Array [