Merge branch 'feature/update_wifi_lib_for_some_refactors' into 'master'

esp32: update wifi lib for some refactor

1. Refactor for wifi ebuf management
2. Refactor for wifi rate control/long rate/tx

See merge request !662
This commit is contained in:
Jiang Jiang Jian
2017-04-13 14:22:04 +08:00