Rpcdaemon: Gracefull shutdown, better grpc stream close (#1196)

* save progress

* GracefulShutdown grpc server, send to server close signal before canceling context

* GracefulShutdown grpc server, send to server close signal before canceling context

* GracefulShutdown json server

* GracefulShutdown json server

* fix lint

* fix lint

* can

* clean

* test

* test

* test

* increase keepalive timeout, increase vegeta timeout, mark server-side errors

* increase keepalive timeout, increase vegeta timeout, mark server-side errors

* hack hugeFreelist

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* up streams limit

* fix_race_condition_on_zstd_build