add tech-support-qq-4

For cases like #2162, there are other property source wrappers like jasypt, so we won't be able to decide whether to trigger this change or not.
So it's better just to trigger it as it is idempotent.

Fix SSRF, resolve #2103

* Try to support JDK 8+

simplify k8s deployment

修复因为Dockerfile中ENTRYPOINT导致运行容器read-only报错
修复多个环境使用同dev环境注册中心导致web管理界面获取admin Server不一致

fix conflict logical in properties config.

support setting app id from OS environment variable APP_ID

Add OpenAPI to get application information

modified spring security user update and delete sql by use primary key  for support database set SQL_SAFE_UPDATES = 1 #1997 (#2016)

* bugfix: line feed under Windows. resolve issue #2015

feature: diff configurations among clusters. issue #1966