[dts] [PATCH V1] tests/TestSuite_telemetry: Adapting python3 code rules

[Tu, Lijuan]

> Subject: [dts] [PATCH V1] tests/TestSuite_telemetry: Adapting python3 code
> rules
> 
> The coding styles of python2 and python3 are different, modify script to
> adapt to python3.
> 
> Signed-off-by: ChenBo <box.c.chen at intel.com>

Applied, next time please:
	1, remove prefix "TestSuite" in subject to reduce text count
	2, don't use capitals in general