OTP Tool : Add TEST_ALIVE command
OTP Tool : Add TEST_ALIVE command

TEST_ALIVE is a basic test to check if the device has booted
by exchanging data over serial port. The host sends TEST_ALIVE
command via the otp_tool.py script and in response, the payload
is 20 bytes (0x0 - 0x13)

Signed-off-by: Naveen Kaje <79e427f88b1293e6ef90566b3bd0a85565336125@juul.com>

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core