Serial port listener and writer has been populated with "read flag" behavior.

It is incorrect to write some sort of data to a serial and read that data at the same moment. End device on the serial port sometimes loss data.

* fix data loss on the serial connected device
Arduino-blinking method has been implemented.

ZigBee serial connection has been tested with Arduino-based ended device. There are blinking service available with GK and implemented at the Arduino.

* new Arduino-blinking service available
* some Spring configs has been refactored
* Zeebus entry poing (App.java) has been refactored with MQTT and serial readers and writers