Add: Go modules support

1. Update: LDAP to V3
2. Update: github.com/gocraft/dbr to v2
3. Update: Redis to v7
4. Update: Dependencies
5. Fix: Breaking changes, remove the dependency of old coreoespackage.
6. Add: Go mod
7. Remove: Previous Gopkg

https://sprint.mkcl.org/zentao/task-view-382.html