merge from 1.5 to 3.0

fix: fix bugs caused by 1.5

Ftr/self discovery

Ftr:  Use invoker with same ip as client first.

Ftr:  Add an "api way" to set general configure

Fix/graceful shutdown

Ftr: registry ip:port set from enviroment variable

fix:nacos service provider does not require subscribe

Format go.mod for Goland