feat(router): update OLTP/OLAP feature flags to be compatible with each other (#389)
Files to modify:


**router.rs**
  Modify existing code

**lib.rs**
  Remove:
    - function: pub::mk_oltp_app
    - function: pub::start_oltp_server

**app.rs**
  Remove:
    - function: pub::oltp_server
    - function: pub::olap_server
    - function: pub::olap_server
    - function: pub::olap_server
    - function: pub::olap_server
    - function: pub::olap_server
    - function: pub::olap_server

**utils.rs**
  Modify existing code