RPC is not ready yet at this point, so we should not set this application state yet.
Also, simplify add_local_application_state as it contains dead code
that will never generate an internal error after 1d07a596bf.
Fixes#16932Closesscylladb/scylladb#17263
* github.com:scylladb/scylladb:
gossiper: add_local_application_state: drop internae error
transport: controller: do_start_server: do not set_cql_read for maintenance port