rtu: add mock modbus test device

Add the mocked modbus test device/server. The purpose of this mocked
device is to help facilitate testing on Qemu VM. More details are
captured in Readme.md file.

C

rtu: add mock modbus test device

Add the mocked modbus test device/server. The purpose of this mocked
device is to help facilitate testing on Qemu VM. More details are
captured in Readme.md file.

Change-Id: I3b09f4057ea5cc03db101b81f435ae772d51d601
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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