This PR aims to clean up the useless code for LLM setup. It helps to
make the code more clear.
1. remove useless `self.xxx` property
2. change `set_random_seed` to `seed_everything`
3. remove `set_custom_all_reduce`, it's only used for cuda
This is just a code clean. no change for any code logic.
Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>