* Enable use of alternate hardware UARTs for logging
Enable use of Serial1 on ESP8266 and Serial1/Serial2 on ESP32 for logging.
This is frequently done on ESP8266 to allow use of Serial for UART TX+RX,
while maintaining logging output on Serial1 which is TX-only via GPIO2.
* ESPHOMELIB_UART -> UART_SELECTION_UART; HW_UART -> HARDWARE_UART
* Add test3 to travis; remove test4
* Set DEBUG_ESP_PORT based on logger UART setting
