feat(esptool): Not check if the port exits.
feat(esptool): Not check if the port exits.

MacOS cannot list named "tty.XXXX" tty but can list "cu.XXXX" tty.
But user may use "tty.XXXX" default.

espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK