* #665 support get/set config via CLI

* #665 support get/set config via CLI

* #665 add unittest for config CLI

* #665 remove config_node_map_

* #665 remove config_node_map_

* #665 fix clang-format

* #665 fix clang-format

* #665 update changelog

* #665 code clean

* #665 update API interface

* #665 update API interface

* #665 handle server status

* #665 handle unknown command

* #665 update debug log

* #665 rollback CmdRequest.cpp

* refactoring(create_table done)

* refactoring

* refactor server delivery (insert done)

* refactoring server module (count_table done)

* server refactor done

* cmake pass

* refactor server module done.

* set grpc response status correctly

* format done.

* fix redefine ErrorMap()

* optimize insert reducing ids data copy

* optimize grpc request with reducing data copy

* clang format

* [skip ci] Refactor server module done. update changlog. prepare for PR

* remove explicit and change int32_t to int64_t

* Add log to debug #678

* Rename nsg_mix to RNSG in C++ sdk #735

* [skip ci] change __function__

* clang-format

* Add log to debug #678

* Rename nsg_mix to RNSG in C++ sdk #735

* [skip ci] change __function__

* add TracerUtil

* Interceptor ok

* add handler

* add context

* minor update

* keep span in trace context

* add span in search okay

* Update Context.cpp

* refactor

* refactor

* refactor

* format

* add context in SearchJob

* trace search okay

* add back finish span in interceptor

* add namespace

* add tracing config in server config

* add random id

* debug mode okay

* update CMakeLists

* add opentracing to cmake

* update unittest

* add tracing namespace

* remove std::run_time error

* add lock when erasing context_map

* update tracing config

* lint

* update CHANGELOG

* small fix

* fix server unit test

* fix scheduler unit test

* fix db unit test

* lint

* fix db unit test gpu version

* rename to tracing_config

* fix

* update

* trigger ci

* remove unused function and comments

* remove always-true parameter

* run on python2 explicitly

* fix clang-format

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log

* #674 server down in stability test

* add more log

* remove log

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #709 show last commit id when server start

* #709 fix typo error

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log

* #674 server down in stability test

* add more log

* remove log

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #696 metric_type changed from IP to L2

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log

* #674 server down in stability test

* add more log

* remove log

* #696 metric_type changed from IP to L2

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log

* #674 server down in stability test

* add more log

* remove log

* #670 Random failure of unittest db_test::SEARCH_TEST

* add an important log

* add an important log

* add an important log