UnicodeDecodeError for RunTest.py script when running tests on Docker

[sylwpro]

"UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 1: invalid start byte"

Files with serial data used for outStr, refStr in SerialOutputComparator class in script Processor\Tools\TestDriver\RunTest.py are opened in UTF-8 on Docker. Maybe it would be better if it was binary comparison.

[shioyadan]

I confirmed that some test programs can actually output data that cannot be handled as UTF-8 and it can actually cause the problem. I am currently working on cleaning up test programs and I will change the script to treat data as binary in this branch. Thank you.