Add auto refresh config support

Portal read config

Update checkstyle conf

remove h2 default user and password

fix meta server url

integrate mysql and update meta address

Update default port

Integrate env & service discovery in client

Add refresh config support and refactor

Rename Server to Service

Update config to support multiple processes

Use dto namespace instead of model and updated the demo page

Merge MetaServer into ConfigServer

增加portal前端页面&创建app功能