update public certificate and enable certificate verification
ODROID: IoT: Remove build dependency with prebuilt.

This patch removes build dependencies with prebuild MQTT library in order to
use open source MQTT packages. You must have such library on your build and
target system. You can download the library source code from below URL.
    [1] http://git.eclipse.org/c/paho/org.eclipse.paho.mqtt.c.git/

Change-Id: I20c9afab27a90cc85cf869f5582fa35cdda7b6f6
Signed-off-by: Dongjin Kim <tobetter@gmail.com>
ODROID: IoT: Change device name to report

Change-Id: I6f5c860c12692295d297c6fab7f9c0850fae1f08
Signed-off-by: Dongjin Kim <tobetter@gmail.com>
ODROID: IoT: Replace device name to ODROID-XU3

The device name Raspberry Pi is replaced to ODROID-XU3

Change-Id: I47c238edfdd1513771c028a3efe0c1a24deea43b
Signed-off-by: Dongjin Kim <tobetter@gmail.com>
ODROID: IoT: Replace device type to iotsample-odroid

The device type iotsample-raspberrypi is changed to iotsample-odroid.

Change-Id: Ifae4005c0d80dc974674adae96bc3022ce92ffb6
Signed-off-by: Dongjin Kim <tobetter@gmail.com>