[python3] utils.ETSource: encoding.
[python3] utils.ETSource: encoding.

--HG--
extra : transplant_source : %FC%D72%81q%8F%5D%26%13%17%A9%87%16tTy%A4l%CA%02

userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework