refactor ParallelConf (#3268)

* refactor ParallelConf

* refactor parallel_conf

* fix parallel_conf init

* refactor opkernel_instruction_type init/compute

* fix test_cpu_only_user_op

* remove notes

* fux non_distributed_optimizer_pass.cpp bug

* fix code style

* fix a small bug

Co-authored-by: Li Xinqi <lixinqi2010@gmail.com>