Added proper handling of unicode messages by expiclit
usage of unicode and utf-8 encoding for Python2.
For Python3 it was just sufficient to ensure that message
is properly UTF-8 encoded. Results of that change can be examined
inside Kibana (or using link [2]).
To prevent any regression, a set of unicode messages has been
added. It contains:
* 'Unicode is evil...' sentence translated to several languages
* border conditions of UnicodeStressTest [1]
* some funnier examples just because programming is fun
Extra:
* unified setting up API test case
[1]: http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt
[2]: https://pasteboard.co/x9gQqicR.png
Story: 2001084
Task: 4734
Change-Id: I36e3c2f1ea5788ecb19089089d84924b7d6666bf
21493ac9cf
