Revert "Merge branch 'feature/optimize_dhcp_proc' into 'master'"
Revert "Merge branch 'feature/optimize_dhcp_proc' into 'master'"

This reverts merge request !1554
espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK