1. "lwip_socket" should close by "lwip_close_r" other than "lwip_close"
2. for generally compatible, fix all lwip interface to normally socket interface
3. call vTaskDelete when new socket failed in case of task crash
close #https://github.com/espressif/esp32-at/issues/58
Do some refactor to socket ping:
1. Add ping_deinit to kill ping thread
2. Apply configuration set by esp_ping_set_target to socket ping
3. Limit only one ping thread
