Fix react-native CLI (internal and external one)

Summary:
- Fix wrong debugger-ui path
- Override host and port using args

Reviewed By: yungsters

Differential Revision: D8731159

fbshipit-source-id: ca8ad76a02eda9e0b9cdb1a952aa5631d660868f

local-cli/server/middleware/MiddlewareManager.js

@@ -40,7 +40,7 @@ module.exports = class MiddlewareManager {
   options: Options;
 
   constructor(options: Options) {
-    const debuggerUIFolder = path.join(__dirname, 'util', 'debugger-ui');
+    const debuggerUIFolder = path.join(__dirname, '..', 'util', 'debugger-ui');
 
     this.options = options;
     this.app = connect()

local-cli/server/runServer.js

@@ -66,6 +66,8 @@ async function runServer(args: Args, config: ConfigT) {
         : config.getTransformModulePath(),
       watch: !args.nonPersistent,
     },
+    host: args.host,
+    port: args.port,
   });
 
   // In Node 8, the default keep-alive for an HTTP connection is 5 seconds. In